Anything that allows an insane amount of anonymity over the Internet in order to pry information from another person is nothing short of cowardice and is subject to the malicious intention of many people seeking to hide using Formspring's anonymous function.
I'm glad I don't have one.
Why should I tolerate sensationalist cowards?
If you cannot tell something to a person face-to-face, it's probably not worth saying, or one has malice intended or guilt hidden.
So say or ask what you need personally. Every human being deserves that much.