It's a little game he plays.
He sends out a photograph of himself and gives you a chance to Photoshop it into something humorous. If he likes it, he re-tweets it and you get your 15 minutes of heart palpitations because, "Oh My God, Wil Wheaton thought my stuff was F-U-N-N-Y!"
Wil is an actor, writer, producer, gamer, beer drinker, all-around geeky nice guy on the Internet.
Here's my photo:
Well, Wil didn't pick mine to re-tweet.
No heart palpitations this time.
But that's okay.
Tomorrow's another day!