Google+ attracts 25 million visitors. [Reuters]
Peter Thiel’s Airy Labs raises $1.5 million. [ATD]
Yes, Amazon is ramping up the battle over whether or not it should pay sales tax. [WSJ]
Lady Gaga and Kanye West have reportedly invested in Turntable.fm. [BI]
An unnamed country apparently hacked the U.S. for five years. [NYT]
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