I've always been weary on actual usage numbers on mobile applications. The HN crowd are probably more on the higher end of usage, but I find in general users on

I've always been weary on actual usage numbers on mobile applications. The HN crowd are probably more on the higher end of usage, but I find in general users only use a few of the well known web apps - mobile versions of their applications consistently. Approximately 30% of registrations usage of once a month is not that good. USV's portfolio companies are also some of the biggest mobile apps available now.