5 Things To Know This AM — Sep 09 2011

Twitter has reached an impressive 100 million active users. (NY Times)
And Google now owns Zagat. Yes, that's the sound of Yelp, um, yelping. (Eater SF)
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The BART police arrested nearly 30 people, including journalists, at another transit protest at the Powell Street station. (HuffPo SF)
An opera based on the 9/11 terrorist attacks will make its world debut in S.F. this weekend. (The Bay Citizen)
The entire kitchen staff at Wharf eatery Castagnola's walked out on Labor Day to challenge recent changes. In return, all were fired. (SF Gate)
BART
Photo: HuffPo SF
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