Groupon's sociability level anecdote: I have ~100 facebook friends; one of them posts a groupon deal she considers interesting once every few weeks. Reliable l

Groupon's sociability level anecdote: I have ~100 facebook friends; one of them posts a groupon deal she considers interesting once every few weeks. Reliable local service anecdote: I'm looking to rent a house, and after finding the first page of Google results for "rent house" to be spam, have restricted my search to Craigslist.