Apple (AAPL) has paid $20M to acquire Silicon Valley start-up WifiSLAM, which develops ways for mobile apps to identify a user's whereabouts in a building using Wi-Fi signals. The technology can enable new types of retail and social networking apps, and would allow Apple to match Google in offering indoor mapping in places such as airports and shopping malls. Meanwhile, Apple had to temporarily shut down its password reset system on Friday due to a security flaw.
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