this is "nightline." >> tonight, review revenge. beware the nasty review. this woman says bad dental work ruined her smile, but she's the one getting sued. >> and how do you raise the dead? with a lot of makeup. tonight, we're taking you to the location where the twisted minds behind "the walking dead" are sinking their teeth into a new season. more than 16 million viewers are gobbling it up. but first, the "nightline" five.

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good evening. thanks for joining us. if you have ever suffered through a bad meal, sometimes you just want to vent. the woman you're about to meet says the damage from a dental

procedure she has was lasting. but the negative review led to unexpected backlash, because business owners are fighting back. >> her face is her fortune. she's a model. she struggled with chronic pain. >> i was a long sufferer of neck pain. >> she went with her then-husband to a dentist. he said he could fix her problem. >> i was impressed. >> he said he could make her teeth two millimeters bigger with veneers and that would stop the pain. >> i said, you think that will fix it? he said, absolutely. >> according to her, for more

than she bargained for. she says it left her with what she calls man teeth. >> i had bigger teeth than everybody. it's not normal. >> big teeth. wow. >> they were like chiclets, rabbit teeth. i couldn't close my mouth. >> and two years later, jeff took to yelp calling the dentist a butcher and a crook. and he sued them, claiming it was another dentist, not him

that removed or destroyed his work. >> once you start stating facts, you could be held accountable. if it's demonstrated that the facts aren't true. >> yellpers enjoy the right to free speech and exercise that to help their fellow consumers. >> but the dentist says there's not freedom of speech to lie and tell falsehoods. and he's not alone in fighting back. more and more are taking the fight into their own hands. when this man had a bad report on yelp, the hotel didn't take it lying down. >> we received an e-mail that

there would be a $500 fine for each negative review that we post online. >> the bride and groom overlooked this fine print on their contract. a $500 fine will be added for every negative review. the story went viral, and consumer fury ensued. and just like that, the rating on yelp plummeted. and angry, outlandish reviews, saying it was the worst hotel in history. and the hotel said it was intended as a joke, but now realizing it was in poor taste and not funny. over the last years, the reviews have taken on a life of its own.

with these actors acting out these reviews. >> such a disappointment. >> all jokes aside, yellp has become a big force. in fact, more than 50 million businesses have a presence there. and a one-star increase there translates to a 5% to 9% increase in business. >> these lawsuits are a form of bullying, a tactic to silence your critics. >> and the impact of a bad review is all too real for businesses, and they say they have to take action.

this man took issue with one comment that he says went too far. >> in one case, a individual made extremely derogatory remarks about the restaurant, the food, about myself. we decided to sue for defamation. >> and for yelp reviews, some reviews aren't even real. >> i will write a positive review for anything you like. >> this woman said she would write positive reviews for $400 apiece. she read us one of her fake reviews. >> i made the appointment over the phone, and the next day,

they were working on my bathroom. >> and some try to write their own reviews, and we have to protect consumers so they find our service useful. >> the reason consumers, 138 million of them each month, come to our site, we protect the content, and try to keep them from biased or solicited reviews. >> there was nothing other than folks, this is our experience. watch out. >> i'm here today because of this freedom of speech. if he wins, that means none of us can go on social media and

write our truthful decision. >> a legal headache that for now could still have some teeth. up next, we take you inside the super-secretive set of a fresh season of "the walking dead." how could they possibly up the ante this time? except that managing my symptoms was all i was doing. and when i finally told my doctor, he said humira is for adults like me who have tried other medications but still experience the symptoms of moderate to severe crohn's disease. and that in clinical studies, the majority of patients on humira saw significant symptom relief. and many achieved remission. humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure.

before treatment, get tested for tb. tell your doctor if you've been to areas where certain fungal infections are common, . . . about humira. astroenterologist with humira, remission is possible. denturthan real teeth.erent they're about ten times softer and have surface pores where bacteria can multiply. polident kills 99.99% of odor-causing bacteria and helps dissolve stains. for a cleaner, fresher, brighter denture everyday.

so, who would willingly walk into a zombie apocalypse? turns out, plenty of devotees of

amc's smash hit, "the walking dead." one of those fans, dan harris, who wound up with a zombie bite on his arm. >> reporter: driving into the countryside of georgia. i can't tell you where i'm going. under strict orders not to reveal the location. we're going to the set of "the walking dead." this show about a hearty gang of folks trying to survive the zombie apocalypse is one of my favorites and i'm not alone. millions watch this every sunday night on amc. how would you describe season five without giving anything away. >> the first episode, i was

leaning over and i said, they're never going to be able to show this on tv. >> reporter: is this vomit? >> yes. >> reporter: and trying to make this show as believable as possible. >> i do like blood a little bit too much. >> reporter: that dude doesn't even have a nose. >> oh, wow. yeah. we need to make his buttons shiny. >> reporter: i'm fixating on the nose, but you're talking about his buttons. how you doing, man? how are you going to eat lunch? they also pay particular attention in the weapons department. the cross bow used by darrell

does not fire real arrows. can i shoot my cameraman? >> sure. you have to be ten feet away. that's the rules. >> reporter: awesome. he's been bothering me all day. close your eyes. >> they pick it up, and shoot it into things, in the head. >> reporter: so, he's just shooting this little toy thing with a rubber band? >> no, he's a bad ass. >> reporter: and this very real and very powerful, as i found out. but back to the zombies, here's one of the weirdest, creepiest office spaces on earth. >> a jawbone sticking out.

>> reporter: this is an office full of horrors. greg is a makeup expert and occasionally will direct the show. i asked him why this show is popular with women and also evangelical christians. >> there's something for everybody. people that want the gory stuff, and people that like the characters will catch it for that. >> reporter: my wife won't watch it, she's too squeamish. >> but if you showed her the right episode -- >> reporter: she would watch it, right. and she may be entranced by perhaps that darrell guy. and one of the buzzest issues among fans heading into the

season five premiere is whether darrell may be gay. what is your view on the online speculation? >> i don't think he's going to throw someone up on the tree and kiss them in the moonlight. so, i'd like it to be as awkward as possible. >> reporter: there's been a lot of media churn about darrell. >> i think he's a virgin. like a shy 12-year-old that doesn't know how to handle the emotions he has. >> reporter: after a quick visit to the makeup trailer to get a bite affixed to my arm, they let us get close to the set. they're super paranoid because

they have fans known as walker stalkers posting spoilers online. without spoiling anything, how would you describe the upcoming season? [ humming ] >> the thing with this show, it's constantly moving in different directions. >> reporter: and it's striking how lighter they are in real life than on screen. here's josh mcdermott, who may have a way to cure the world of walkers. and this actress gets glamed up on the red carpet, but on this show she is dirty and dexterous.

i think you could probably kick my ass if you had to. >> i have a line in a sense. i'm not a girl that goes down easy. but i'm -- >> reporter: what would you treat this with? >> i would put this banana peel on it. >> reporter: but wouldn't you just chop off the arm with a bite? >> yeah, we should go from here. >> reporter: i walked off even more of a fan, seeing the effort and details so that viewers will invest in the world they've created, and knowing that the actors are funny and nice on the show. and i could even get my wife involved in the show.

>> that couch is cold without you. >> reporter: that's right, you heard it here. dan harris, at an undisclosed location in georgia. up next, microsoft's new ceo under fire for telling people they shouldn't ask for a raise while at a women's conference.

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the ceo of microsoft, being asked to step down tonight after

advising woman not to ask for pay raises. instead, trust in a system in which they earn $11,000 less than men. now, he's scrambling, saying he's wrong. is his apology being accepted? here's paula faris. >> it's about knowing and having faith that the system will give you the right raises all along. >> reporter: that's satya nadella, speaking in front of 8,000 women. his advice asking for a raise? don't. >> that's good karma. somebody will know that's the kind of person i want to trust, i want to give more responsibility to. >> reporter: women in that room telling us they were stunned to hear the so-called advice.

>> i don't believe in karma. i can't pay my rent with it, and can't invest it in my 401(k). >> reporter: even his interviewer fired back. >> this is one of the few things i disagree with you on. >> reporter: and this tweet, i never got anything in life by sitting quietly and waiting, neither did you. and microsoft employees receiving this e-mail from satya nadella, saying i answered this question completely wrong. and experts suggest that if women received equal pay, the u.s. economy would go up by nearly 3%. and sarah silver plan has a way for one way to even things out.

>> i'm becoming a dude. >> reporter: for "nightline," paula faris, in new york. >> and experts say, if you're a man or a woman, you have to ask for a raise. good luck. tune in to "good morning america" tomorrow morning. and we're always online. good night, america.