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Twitter’s number of monthly unique visitors finally surpassed that of MySpace in August. Though it ranked third among social networking sites, Twitter ranked #50 in the list of top 50 properties overall. The numbers were crunched by the marketing research firm comScore.

Twitter is now selling its "Promoted Tweets" for $100,000, according to an article in this morning's Wall St. Journal. "Promoted Tweets," which allow companies to buy the top spot on Twitter's Search results page, is just one of the microblogging network's new advertising initiatives as of late. The idea behind these digital ads is that the service allows companies to associate themselves with a certain trend or keyword.

A controversial Twitter user has been challenging South African authorities by alerting thousands of followers to speed traps set by traffic police.

Thousands of Twitter users have been hit by an apparent security flaw that can cause pornographic content to appear on the site unintentionally, according to a researcher at the security firm Sophos.

A redesign is part of the Web site’s plan to regain momentum as it has lost ground in a crowded field that includes Facebook and Twitter.

Fans who want to keep up with John Mayer will no longer be able to do so via Twitter. The singer-songwriter deleted his account, leaving behind 3.7 million followers.

Twitter unveiled a new Web site on Tuesday that it hopes will be user friendly. The redesigned site, which will be available to all users in the next few weeks, makes it simpler to see information about the authors of Twitter posts, conversations among Twitter users, and the photos and videos that posts link to.

Yahoo is redesigning its email service to help stem a user decline and counter offerings from longtime rivals Microsoft and Google as well as social-networking services such as Facebook and Twitter.

There's a hot new Internet rumor about that Justin Bieber kid — and unlike the syphillis and unlikely dating matches, this one is probably accurate.