Great summary. A friend once commented that there are no long term winners in social networks, drawing a path all the way back to compuserve. I thought it was

Great summary. A friend once commented that there are no long term winners in social networks, drawing a path all the way back to compuserve. I thought it was an interesting point, but I remember thinking anything pre-web didn't really count (for no real reason I suppose). Now I think I agree with him that medium doesn't really matter. The confidence of their user base is everything and once its gone, its like watching a giant fall over for years.