There's a lot of discussions about the rights and wrongs of Craigslist approach. It seems to me though the seeds to destroying it are all here. When you enable

There's a lot of discussions about the rights and wrongs of Craigslist approach. It seems to me though the seeds to destroying it are all here. When you enable a powerful ecosystem around your core offering you get a network effect. Whomever decides to build a replacement to Craigslist should put at the top of their list "Enable 3rd party developers to prosper from our core offering".