In light of Facebook’s disappointing IPO, I'll pull up an article I wrote in February, which said, “... social networks have always been poor at monetizing their traffic, and that hasn’t changed since they gain popularity. Click-thru rates for ads on social networks have always been really low, so they can’t charge nearly as much as Google per pageview. That hasn’t changed since social networks entered the internet landscape and won’t change in the future.”
Senh: Now that Twitter's doing celebrity endorsements in-house, what's gonna happen to third-party apps that do the same, like Izea, Ad.ly and twtMob? They'll probably take a hit now that celebs can go directly to Twitter. Depending on how big Twitter's ad sales team is, the third-party clients will probably end up getting their leftovers.