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China told foreign embassies Tuesday to stop publishing their own reports on air quality in the country, escalating its objections to a popular U.S. Embassy Twitter feed that tracks pollution in smoggy Beijing.

Officials from Twitter are looking into what appears to be 50,000 email and password combinations posted to Pastebin earlier this week. After a brief analysis, the list consists of 20,000 duplicates, many suspended spam accounts, and unlinked user name and password combinations. No person or group has claimed responsibility for the leak.

With new food, revamped decor and an embrace of Twitter and mommy blogs, McDonald’s has returned from the brink of a public-relations nightmare.

Demi Moore is no longer (at)mrskutcher, in real life or on Twitter. The 49-year-old actress changed her Twitter name to (at)justdemi on Thursday.

The creation of the guidelines reflects concerns about the misuse of sites like Facebook and Twitter and follows accusations of misconduct by teachers with students.

Pepsi is tweeting to a new generation of music lovers. The No. 2 soda company is partnering with Twitter to provide streaming videos of live music concerts to Pepsi's followers on the social networking site.

Meet the king of the sporting Twittersphere: Brazilian soccer star Kaka. The Real Madrid midfielder on Wednesday became the first athlete to amass 10 million followers on the social networking site. "Thank youuuuu. To celebrate I'll make a twitcam" wrote the 30-year-old Kaka, who at the last count had 10,012,862 Twitter fans. He's nowhere close to Lady Gaga and Justin Bieber - who each have more than 20 million followers - but it's not a bad haul for a player whose career appears to be on the wane after becoming a superstar in a golden six-year stint at AC Milan in Italy.

Those mediocre updates about choosing a food truck for lunch, complaining about work, or a link to the same viral video you saw a month ago: No, it’s not just you rolling your eyes and scrolling quickly.

Over the past year or so, Beyonce has opened the door to her heavily guarded private life and invited her adoring public in.

The pop singer tweeted 9 out of 10 digits of an alleged phone number, and then asked his 19 million followers to "Call me right now." They responded by trying to fill in the 10th digit, causing switchboard chaos.