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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.

Twitter advertising network Ad.ly, which launched last year, has raised $5 million in additional funding led by GRP Partners with Greycroft Partners and Matt C

Amazon.com Inc.'s Kindle e-reader is getting access to Facebook and Twitter, along with several other enhancements, as part of a software update being sent wirelessly to the devices.

In a posting on Amazon's site, the company says the new software will let users share book passages on their Twitter and Facebook accounts. The update will also let people sort books and documents into collections and lock their Kindle with a password. There also will be larger font options and the ability to zoom in on PDF documents.

Black people make up 25% of Twitter users, compared to just 12% of the population. Why?

Hugo Chavez is starting to use Twitter to counter his opponents online, forcing a president who often talks for hours to sum up each thought in 140 characters or less.

Every 140-character snippet of info you've ever shared publicly on Twitter will soon have a home next to the Declaration of Independence.

Ads will be rolled out to two to 10 percent of users via search on Twitter.com beginning today.

Twitter's homepage got a new look Tuesday, featuring a scrolling list of "top tweets" designed to give non-members a look at what they're missing.

A Conan O'Brien Twitter account surfaced this evening under the name @ConanOBrien and it is growing rapidly.

So did Conan O'Brien just join Twitter?

At first, it wasn't certain, but just an hour and a half after the inaugural tweet, Twitter added a "verified account" stamp to the page.

Conan's first tweet, posted at approximately 6 p.m. Feb. 24, 2010, said: "Today I interviewed a squirrel in my backyard and then threw to commercial. Somebody help me."

Yahoo! and the micro-blogging site Twitter have struck a content-sharing deal, they announced Wednesday -- a plan that will share real-time tweets with the 600 million users in Yahoo's global network.