Twitter, mixi form Japan tie-up as Facebook gains

(AP) -- Twitter Inc. and Japan's biggest homegrown social networking site mixi Inc. joined forces Wednesday to strengthen their ground against a rapidly expanding Facebook.

Twitter study reveals explosion in Arabic 'tweeting'

The popularity of Twitter has soared in the Arab world over the past year, a study published Thursday revealed, reflecting the key role of the social networking site in the "Arab Spring" revolutions.

China microblog users top 300 million: reports

More than 300 million people in China now have microblogging accounts, a state-run newspaper reported, as the country's fast-growing online population seeks to bypass tight media controls.

Big payouts from startups excite Silicon Valley

Everyone dreams of striking it rich - and what they would do with such a windfall. A new house? A fancy car? Maybe designer clothes selected by a personal shopper. For some in Silicon Valley, those wishes may soon come true.

Feds: Social network for kids violated privacy law

(AP) -- Federal regulators have reached a settlement with an Atlanta-based social networking site over claims that it illegally obtained personal information from children.

US teens say peers are 'mostly kind' online: study

Most US teenagers who use social networking sites say their peers are "mostly kind" to one another online although the vast majority have witnessed mean or cruel behavior, a study said Wednesday.

Arctic chill brings Facebook data center to Sweden

(AP) -- Facebook will build a new server farm on the edge of the Arctic Circle - its first outside the U.S. - that will improve performance for European users of the social networking site, officials said Thursday.

China's Tencent launches English microblog site

Chinese Internet giant Tencent has launched an English version of its Twitter-like microblogging service in a push to tap the overseas market, the official Xinhua news agency reported Tuesday.

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