Mobile app Thumb, which has been asking users to provide their opinions since its original private beta launch in June 2010 as Opinionaded, today revealed to TechCrunch that it now has more than 1.2 million registered users. It marks the first time the company has talked in detail about its specific user population size. Thumb has been vocal about engagement stats in the past, however, telling TechCrunch in December of last year that users receive on average 50 to 100 responses to questions they post on the site, which can be about anything, and which other users can comment on or thumb up and thumb down.