What is the crowd's opinion of Mindbloom?
From 3.5 billion comments

➔ Mindbloom website

By popularity online, this Service is:

#153 in Todo List apps

1 review of this app found across the web:

I thought Proof would be a good name, but it turns out so did someone else: http://www.mindbloom.com/about/announcements/new-proof-challenge-app-sparks-friendly-competition-between-friends-families-and-colleagues-to-make-reaching-goals-fun/

Then I also found Klash (https://www.klashapp.com/) and ChallengeLoop (http://www.challengeloop.com/mobile).

If you've got a good twist or a better business plan, how about something like "Do-nation" / "DOnation"?