The Wall Street Journal reports that Apple has acquired indoor location company WifiSLAM, paying around $20 million for the firm. Apple has confirmed the purchase, but declined to offer any details on its plans for the acquisition.The two-year-old startup has developed ways for mobile apps to detect a phone user’s location in a building using Wi-Fi signals. It has been offering the technology to application developers for indoor mapping and new types of retail and social networking apps. The company has a handful of employees, and its co-founders include former Google software engineering intern Joseph Huang.Apple has been beefing up its location expertise over the past several years through acquis
