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If it wasn't bad enough that Facebook bought FriendFeed on Monday and turned on real-time search to better compete against Twitter in the Stream Wars, and is playing around with a lite version that resembles Twitter even more, now Twitter really has something to worry about. Facebook is growing faster than Twitter in the U.S., even though it is more than four times larger.

Everyone is obviously talking about the Facebook/FriendFeed deal, but everyone wants to know one key detail: How much did Facebook pay?

The popular social networking site Twitter has been hit by a denial of service attack, according to Twitter co-founder Biz Stone. In an e-mail to CNN.com, Stone said this morning's attack is not related to a recent incident in which a hacker stole internal documents from the site. Twitter's site went down around 9:30 a.m. ET.

A star player who was fined thousands of dollars for a post about the quality of training-camp foods is talking about his tweet.

Antonio Cromartie was fined $2,500 by the San Diego Chargers after a post last Friday about the fare the Chargers were serving.

The global rise of Facebook is nothing less than astounding. In the month of June alone it gained 24 million unique visitors worldwide, compared to the month before, for a total of 340 million unique visitors worldwide. It is now the fourth largest site in the world, trailing only Google, Microsoft, and Yahoo sites, according to comScore (see table below).

It's no secret that Twitter has become a preferred playground for spammers. Hashrocket's TweetBlocker sets out to change this by giving users a simple tool to easily identify spammers in the group of users they are following. TweetBlocker automatically identifies the spammers in your follow list and lets you easily unfollow and block them right from the TweetBlocker dashboard.

The U.S. Marine Corps has banned Twitter, Facebook, MySpace and other social media sites from its networks, effective immediately.

Universal McCann has released a new report that looks at the state of social media today. Apparently, this trend is showing no sign of slowing down. In fact, it's still growing. From posting photos to writing blogs, the desire to share has become a universal phenomenon.

Some social networking sites ask for your e-mail address and password when you sign up.

If Twitter needed to pay for the media coverage the company and service gets across the board, it would have spent almost as ...