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Who is "Trending Topics" star Diustin Biber? First, we'll tell who—and what—he/she isn't: The latest workaround to a supposed Twitter ban on Justin...

NASA briefly broke with the standard space jibber jabber, jammed on the cap locks, and began alerting its followers with repeated messages about "BRAND NEW PLASMA FLAT SCREEN TV!!! WHOLESALE LIST!"

The Twittersphere erupted Sunday when former Alaska Gov. Sarah Palin tweeted that "peaceful Muslims" should "refudiate" the mosque being built in New York City near where the Twin Towers once stood. Palin found herself the butt of many tweets, as refudiate, of course, is not a word in the English language. To quell Twitter-ribbing over her snafu, Palin then compared herself to no less than Shakespeare.

Facebook has more users than ever, says comScore. With its most recent privacy backlash seemingly behind it, Facebook surged ahead to a new traffic record in the U.S. during the month of June. According to comScore, the social network pulled in more than 141 million unique visitors in the U.S. during the month, beating its previous record (set in May) by better than 11 million.

CNN has fired Octavia Nasr, a senior Mideast editor, after her post on Twitter about the death of one of the forefathers of Hezbollah raised concerns at the network about her journalistic credibility.

Privately held microblogging service Twitter has agreed to a settlement with the U.S. Federal Trade Commission over charges that it put customers privacy at risk by failing to safeguard their personal information.

Twitter is a hit in Japan, succeeding where other social networking imports like Facebook have foundered as millions "mumble" - the translation of tweet - and give mini-blogging a distinctly Japanese flavor ...

Twitter this week began testing a new type of advertising: “Promoted Trends.” Under the new system, brands can pay to appear below the “Trending Topics,” the most talked-about terms on Twitter at any given moment.

If you're a frequent Twitter user, you've probably noticed that the microblogging site has been crashing repeatedly this week.

Tween heart-throb Justin Bieber is the center of attention on Twitter again, after a very brief exile. Last night, Mashable reported that Twitter had updated its "trending topics" algorithm to highlight topics that were actually trending, rather than just consistently popular. The most visible, and widely discussed, impact of this change was that Justin Bieber -- a permanent fixture in the trending topics -- disappeared.