Here's a good one from FamilyLeaf's YC app: "We used a comedy twitter account to get meetings with tech superstars who wouldn't have returned our emails. In the week before our YC interview, we started @YC_Y_U_NO as a joke with the tech communityand ended up featured on TechCrunch -- and more importantly (coupled with serendipitously meeting FredWilson at the airport, who tweeted out Readstream) used cold DM's to build relationships with brilliant startuppeople, angel investors, and VCs (along with more than a few YC alums/Garry and Harj)."