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News bites: Saudi prince buys stake in Twitter

Saudi Prince Alwaleed bin Talal bought a $300 million stake in Twitter, Reuters reports. 

AT&T's talks to sell off assets to save its purchase of T-Mobile have gone cold, The Wall Street Journal reports.

A federal judge will allow a lawsuit against Facebook to go forward, Bloomberg reports. The lawsuit alleges Facebook illegally used the names and pictures of users' friends in advertisements. 

Social network Google+ unveiled a set of changes, including allowing users to set the importance of their friends' posts.