There’s this neat web service called Formspring which lets people ask you questions - and of course allows you to answer them. All you have to do is sign up for an account, or connect using your Facebook profile. In fact, I remember the service being extremely popular amongst my Twitter followers a few months ago. Then I don’t know what happened, but the service slowly disappeared from my radar.
I think that the lack of an official iPhone client surely played its role in making users forget about Formspring, and Spring by Taptivate is here to solve this problem.