I'm not sure if a limerick can be an ode but mine is anyway. In case it isn't obvious, this is about a (possible) troll who would post comments only as "Anonymous", repeatedly fail to acknowledge the many (correct) responses to his (or her) challenges and fail to respond to the majority of questions. Eventually, all serious attempts at discourse dried up and all that remained were increasingly fantastical posts. It has nothing to do with the civil disobedience group "Anonymous", as far as I know!
There once was a poster, Anonymous,
Whose refusal to listen was ominous,
With the traffic one way,
Only he can say,
Why he stays here and continues boring us.
(Inspired by real events. I won't mention names, except "Anonymous", which doesn't count.)