T-Squared Social, which opened Wednesday and is situated on that famously throbbing hub of New York nightlife — er, E. 42nd Street.The golfer and popstar, who are apparently tighter than Laverne and Shirley, decided to collaborate on the venture during a round of golf on a luxe private course in the Bahamas. As one does.The 22,000 square-foot T-Squared (Tiger and Timberlake, hardy har har), which is the swanky neighbor to a boarded-up sandwich shop and a Sephora, wears a lot of hats.