You find a home you love, and the asking price makes it practically a steal. But you wonder: how do you know it wasn’t built on top of a “relocated” cemetery? Or what if it’s only a few blocks away from the city’s longest-running crackfest? Thanks to several websites and blogs, new home shoppers can now collect “real world” data about prospective neighborhoods and real estate from actual residents, other buyers, and anonymous brokers out to sabotage the competition.