Well, the attitudes you cite aren't really in conflict; there's no contradiction in finding the service to be useful, and still having doubts about the valuatio

Well, the attitudes you cite aren't really in conflict; there's no contradiction in finding the service to be useful, and still having doubts about the valuation of the company. That said, if you view twitter as an advertising medium, then read-mostly users who tweet rarely (or never) could still be a revenue source, so long as they're reading ads along with everything else. A teenage kid who checks for tweets from Justin Bieber five times a day is a pretty valuable ad target (for some ads), but it might be hard to find a trace of them in the data feeds.