Thumb became one of the most successful apps on the market, generating over 3 billion opinions from millions of users. At one point, Thumb was the most heavily used app in terms of usage time next to Facebook, out of over 1 million apps. The company was sold to a market research firm in 2013. (http://www.foundermark.com/digital-ventures/thumb/)
Thumb is a social utility that has 1.2 million registered users and helps people get instant opinions. The company has been featured by CNN, TechCrunch, VentureBeat, Ad Week, and many others as one of the first social networks with a purpose.