Three ways Facebook makes money

As I was reading Inside Facebook by Karel Baloun, I learned something rather interesting. According to Karel, “Facebook makes money in three ways: sponsored groups, targeted ads and flyers.” Concerning the flyers he says, “this method is most fascinating because it is actually a Facebook feature which just happens to bring in money, by enabling user advertising on their own network. If Flyers were free they would be actually less useful, because limiting postings to paid advertisements reduces clutter and spam. Facebook Flyers are superior in every way to archaic posting of leaflets around campus.” This is just like Craigslist charging for rental listings. So charging money actually makes users happy if it increases the usefulness and relevance of a vital service. How crazy is that?!