Successful Web 2.0 business models
I have been thinking about web 2.0 business models over the last few weeks and it occurred to me that there was a dearth of even anecdotal evidence pointing to successful business model implementations of web 2.0. My question is, which firms are operating in profit with a web 2.0 business model right now. Note I am not including those who have successfully sold out to larger players, I am confining my query to effective web 2.0 business model implementations, ones with ongoing profitability (sustainable). The only ones I could think of (off the top of my head) was 37 Signals and maybe EchoSign, thus I put it to you who can you add to this list, is there such thing as a successful web 2.0 ongoing business model, or am I asking the wrong question?