(Black Web 2.0) — New York, NY. The home of the Knicks. The home of Foursquare. So why are Mikhail Prokhorov, Jay-Z, and Gowalla plastered on the side of a building on 34th & 8th overlooking Madison Square Garden? Mikhail is the majority owner of the NJ Nets with hip-hop mogul Jay-Z as the minority owner. Gowalla, based in Texas, is that other location check-in service you may have heard about.