This question is not standard. I asked myself whtis the right attitude toward users who disappeared from the website.
When a friend leaves the Bet Hamidrash or the shul, it is good use to phone to him or to ask about his health.
Virtual communities work differently, every member is not really linked or reachable, this is the rule. A special freedom, sheltered from indiscretions. Website habits are not generated by Jewish criteria. May be that as Judaism centered website, and perhaps mi yodeia needs special rules. E. g. if someone disappeared, perhaps is he ill?... chas veshsalom, or needs he help? I don't know.
On the other hand, may be that the virtual community is out of the real world and, every one is linked only to his real environment.
I am wondering if there are rules in Mi Yodeia concerning the well being of disappeared users. What do you think?