. >> reporter: they're juvenile most about five to six feet long just like jeffrey jacobson. >> i'm 6 you size? jeffrey size. >> with bigger teeth. >> reporter: so far, they're not aggressive and not scaring away brave boarders. >> if i get on and there's just one, i'm right back on the beach. >> reporter: while the shark sightings might keep beachgoers out of the water, the sign, once struggling white population is now growing. >> shark populations around the world are in trouble, so this is a real kind of potential bright spot. >> reporter: shark sightings are happening in some unlikely places. a 1.5 ton great white named mary lee has become a social media sensation, tweeting every time she surfaces. allowing 61,000 followers to track her pings and have fun. mary lee is like the great white kardashian of the ocean tweeted a fan. joe fryer, huntington beach, california. >> the great white kardashian of the ocean. >>> celebrating birthdays, wayne's world, party time, excellent, austin powers as well. actor mike myers turns 52. legend muppetteer and voice of >>> potential problems for

. >> reporter: they're juveniles, most about five to seven feet long just like jeffrey jacobson. >> reporter: it's you sized. >> but with bigger teeth. >> reporter: so far they're not aggressive and not scaring away brave borders. while the shark sightings keeps some out of the water but it's good for researchers. >> shark populations around the world are in trouble so this is a potential bright spot. >> reporter: shark sightings are happening in unlikely places. one has been become a social media sensations tweeting every time she surfaces allowing her followers to track her pings and have a little fun. she's like the great white kardashian of the ocean. hunting ton beach, virginia. >> in sports chris wood at the bmw championship par 3 188 yards. >> once again he's posing. oh, come on. >> that's easy right? hole in one to move him to 12 under par. he finished 12th in the tournament but got the eyes to that i 8. that $150,000. cavs taking on the hawks. lebron james missed his first 10 shots but he's still got. the cavs take game three in overtime 114-111. cleveland one win away from a sweep

. >> reporter: they're juveniles about 5 to 7 feet long just like jeffrey jacobson. >> i'm 6 feet. >> but with bigger teeth. >> reporter: so far they're not aggressive and not scaring away brave boarders. >> if i go out and see a swarm i'm right back on the beach. >> reporter: while the shark sightings might keep some out of the water. this is good news for researchers. the sign the once struggling great white population is growing. >> shark populations around the world are in trouble so this is a real potential bright spot. >> reporter: sightings are happenings in unlikely places. a one on the great white is a social media sensation tweeting every time she surfaces allowing her 69,000 followers to track her pings and have a little fun. mary lee is like the great white kardashian of the ocean tweeted a fan. back out west lifeguards want people to be aware and cautious but this holiday weekend it's the rip currents that might have the biggest bite. joe fryer, nbc news huntington beach, california. >>> don't say you weren't warned. when we come back a new member of the when a moment spo

i'm going to stay out of the water prosecutor they are juveniles, 5 to 7 feet long just like jeffrey jacobsonit's you size jeffrey size but with bigger teeth. so far they are not aggressive and not scaring away brave borders. >> i'm right back out. >> reporter: while shark sightings might keep some beachgoers out of the water, this is good news to researchers, a sign the once struggling great white population is growing. >> shark populations around the world are in trouble. this is a potential drit spot. >> reporter: shark spogts happening in unlikely places. a one ton great white named mary lee a social media sensation, tweeting every time she surfaces loeg 60,000 followers to track her pins and have fun. she's like the great white kardashian of the ocean tweeted a fan. back out west lifeguards want people to be aware and cautious. but this holiday weekend, it's the rip currents that might have the biggest bite. joe friar, nbc news huntington peach,, california. >> all you have to do is tell me you've seen a shark out there, i'm not going in. >> you know what i learned from that package? a s

. >> reporter: they're juveniles, most about five to seven feet long, just like jeffrey jacobson. >> igger teeth. >> it's jeffrey sized. here on the east coast a tagged one and a half ton great white named mary lee has become a social meet ya sensation tweeting every time she surfaces. right now she's apparently off the northern virginia coast. i'm joined by the associate professor of biology at the university of north florida. let's talk about these shark sightings in broad terms, first of all, these shark sightings on the west coast. are they cause for concern? >> they're really not cause for concern, craig. it's interesting that you bring up the west coast because we know a lot about the white sharks on the west coast and, in fact, the area where the juvenile sharks were seen is no surprise what we refer to as a juvenile nursery. so it's an area where the young sharks are regularly found. that's where they regularly occur. that's where they feed until they grow up and become sexually mature and start to reproduce and contribute to the population. so we're aware that they're suppose