This question has come up on meta.stackoverflow.com but it would be nice if the FAQ would also include information on what the commitment requirements are for users in the event they forget that it is on the commitment page of the site proposal.
The Commitment requirements are purposely a bit obscure. Committing to a site means you agree to use the site and help build it.
Just because we're stuck with the task as measuring what that means using the tools at our disposal, that doesn't mean "using the site" should be reduced to a formula of "please ask 5 questions with at least three up-votes and vote 10 times in the next 26 days, and leave 10 comments with at least three of them being up-voted."
It's totally besides the point, and you don't want people thinking that way. You end up with a very forced, robotic community worrying about whether they met their quota of involvement.
[^^^Don't follow that quoted example; I totally made that up.]