Some of the stories people are talking about this morning: »   Twitter app developers have seen a 50 percent cut in early-stage investment over the past year—though it’s not clear if that’s the result of Twitter’s own evolving business model or tied to the number and type of new apps on the market. [ Mashable ] »   Not surprisingly, troubled oil giant BP wasn’t a big spender on search ads before the oil spill in the Gulf. In two months, BP went from spending very little on search advertising—about $57,000 a month—to becoming one of Google’s top advertisers, dropping nearly $3.6 million in the month of June alone. [ AdAge ] »   Craigslist’s decision to shutter its “adult services” listings isn’t likely to end the debate over websites’ responsibility to filter user-gen content. [ WSJ ]