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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.

Tweeting your favorite stories may be getting a little easier. Twitter introduced Thursday a "tweet" button that websites can place alongside their content. The button serves as an invitation to Twitter's legion of users to share what they're reading without having to copy and paste the Web link.

There have now been more than 20 billion tweets since Twitter (Twitter)’s inception, according to tracking service GigaTweet. The milestone comes just two months after the service hit 15 billion tweets and about five months since it reached 10 billion, indicating that activity levels on the microblogging service continue to accelerate.

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.

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

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?