this is not the first walkathon for tyler. the last time he joined this event, he was just hours from undergoing surgery for a new liver. >> i was really sick, you know? so i had to get a liver transplant. >> tyler had been battling a liver disease for years, and it was getting worse. to get a donated liver, you need to be on a national list. for tyler, time was running out. the hospital's medical team worked hard to get him moved to the top of the list. even so, the wait took more than a year. >> and every day we were just waiting. is today going to be the day? is today going to be the day? >> [ sighs ] it's heart-wrenching. you're always waiting, looking at the phone, waiting to get that phone call. and when the phone call actually came in, i think i just sat on the phone speechless, no words coming out of my mouth, and tyler was with me. he just looked at me, and he knew immediately what was happening. >> when they arrived at the hospital, something else was happening that very day -- a walkathon just like this one. that's

you can join a walkathon, sell cookies or wrapping paper -- you can even go swimming. but any way you do it, raising money is a challenge. >> i've done a lot of fundraising for school. >> i think just getting people's attention was the hardest part about it. >> sometimes it's hard to raise money because sometimes people don't take you seriously. >> but thanks to recent technology, teens today have a powerful new tool. it's called "crowdfunding." there are lots of websites that can help you get started. dave boyce runs one of them -- fundly.com. >> crowdfunding is a way to raise money by putting a page online -- a website online -- and then inviting all of your friends through social media to come and join you in raising money for something that you care about. >> the charity i'm raising money for is the boys and girls club of new jersey. it's a charity that focuses on after-school activities for underprivileged children. and i'm going to raise money for their art program. >> courtney is a high-school senior, and she's sold on crowdfunding. >> i've done other fundraisin

. >> we didn't want to do the basic 5k or walkathon&but something that stood out and made a difference. he came with this idea for a run and wrangled me into it and here we are four years later. >> way to go. cupid's undy run expanded to 17 cities across the nation, including australia over the last three years. good to see that happen. >>> still ahead on fox 5,el isestual close call. -- celestial close call. tracking an asteroid. should we be worried? we're going to sit down with someone from nasa to explain it all coming up. (woman) 3 days of walking to givive a breast cancer survir a lifetime-- that's definitely a fair trade. whoo! you walk with friends, you meet new friends, and you keep those friendships. it was such a beautiful experience. (woman) ♪ and it's beautiful ♪ undeniable (woman) why walk 60 miles in the boldest breast cancer event in history? because everyone deserves a lifetime. visit the3day.org to register or to request more information today. ♪ burning like a fire ♪ building up from deep inside it was 3 days of pure joy. susan g. komen's investments in early detecti