As someone who builds an app with slightly less than 60K users, I'd say this is quite telling of the app industry. A lot of people just dump gas on the distribution flame without any sense of retention. They blow up kind of quickly, but then completely burn out. A lot of investors poured money in to mobile startups over the past 2 years, without product or traction and people are starting to panic. They are pivoting and cloning apps in a last ditch effort to get bridge financing.

Perhaps I'm biased, but I think people are going to start rejecting the notion that real time social networks are the end all and be all of consumption and creation on the mobile phone. Users are getting tired of it, and they are giving us that feedback like crazy.

I've heard YC folks always talk about making something 100 people really love before trying to make something 10^n (n > 6) people will really love. I think it's a good approach because it's hard to know whether you're on to something unless you can measure how many new users each user brings in.