Can u please add a feature that,
anybody can ping anybody ( sometimes morethan a user) in comments of a particular question.
Why this feature is important ?
if i have a doubt on some question, may be my doubt can clear by some users i know, if they are not seen that question.
one option i have, send a private message to all the users who i wants to responds,
if you implement pinging option it may useful than above method....
and moreover user should have that preference also... why because some of the users don't want to ping them