Kennett Square's Nathan Egan, a social-media consultant who's worked with such companies Facebook, LinkedIn and Twitter, got a taste of the power of this technology.
In New York on Wednesday, he boarded a train bound for Philly. He came upon a wallet stuffed with $350 in cash, eight corporate cards and a driver's license. Name: Sally Smith Clemens.
Egan, of Freesource Agency LLC, booted up his laptop, found her on Facebook and shot her a message.
Clemens says she called him five anxious hours later, after she decided to check her Facebook account on her handheld to calm herself down.