Hey, rich people with nary a care in the world! Listen up: Although they have yet to go public, Facebook and Twitter (as well as San Francisco-based Zynga) have shares to sell. According to SF Biz Times, "wealthy investors can get a piece of the action long before these companies make their public debuts." How so? Like this: "San Francisco-based SharesPost Inc. and SecondMarket in New York run markets where qualified investors can buy into private companies from insiders who have stock to sell." The perfect stocking stuffer for that special some who already has it all. Trust us, they'll be the envy of the Valencia Corridor! [SF Biz]