From Ars Technica: How Breitbart's flying monkeys hacked yFrog to post that wiener pic.

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http://arstechnica.com/tech-policy/news/2011/06/lewd-prank-on-congressmans-twitter-account-might-be-yfrogs-fault.ars

Lewd "prank" on Congressman's Twitter account might be yFrog's fault

Did Congressman Anthony Weiner really tweet a photo of his, well, wiener? It's possible, but he also might have been "hacked" via an image service vulnerability that makes it easy for anybody to send a photo to a user's account.

The incident happened over Memorial Day weekend: Weiner's official Twitter account sent a link to a photo on ImageShack's yFrog service of a man's bulging underpants. Weiner immediately denied sending the photo, claiming that his account was hacked. As this is a common defense used by politicians and celebrities against Twitter and Facebook boo-boos, many Weiner-watchers took the hacking claim with a grain of salt.

The truth, though, is that it is possible that the Weiner-wiener incident was pulled off by pranksters who knew how to manipulate yFrog into posting a photo to Weiner's account. yFrog, like many other image services, allows users to send a photo to a specialized e-mail address made for that person's account; when the service receives the message, it gets posted automatically and then tweeted out to the world.

The yFrog e-mail addresses given to users aren't public, but they also aren't hard to crack with some patience and some brute force. As noted by the Daily Dot, the format includes the user's twitter name, a period, and a random word between five and six characters @yfrog.com (for example, mine might be something like [e-mail]). And because yFrog apparently accepts submissions to those secret e-mail addresses from any account, any prankster who has guessed the random dictionary word could send a photo to Weiner's account as if it were from Weiner himself.

Of course, getting the "liberal media" to actually cover these sorts of details instead of gossip-mongering about the whereabouts of Wiener's wiener is like pulling teeth...