The leader of the free world got his own Twitter account on Monday:

He racked up 1.5 million followers pretty fast, and A LOT of sexual Tweets arrived in less than 24 hours.  BUT, here's why you shouldn't send him naughty stuff. Sure, with the internet, nothing is ever gone, but when you Tweet the President, it becomes part of the record (because of the Presidential Records Act), so your request for a Portico Tickle Fight may some day come up in a Senate hearing!

The best one I've read so far is from Former President Bill Clinton.