It's easy to look at the problem with Craigslist and think that to challenge it you should build something which does everything that Craigslist does. AirBNB

It's easy to look at the problem with Craigslist and think that to challenge it you should build something which does everything that Craigslist does. AirBNB is a competitor to Craigslist in that it is helping to take it apart piece by piece. Hopefully other YC companies will take on other categories / pieces