Snap, the parent company of Snapchat, made a big splash in its debut on the stock market on Thursday, ending the day at $24.48 a share.
The big market debut means the social network is worth about $28 billion, making it more valuable than American Airlines and Macy's.
The company was founded by Evan Speigel and Bobby Murphy, then two Stanford University frat boys in 2011. Now they're both billionaires before hitting the age of 30.