It's not a hack or tool or anything. I just like to go to the oldest post I can and reply there. You don't get replies but atlest those old posts with no replies can have one from you a whole year later.
If it is a bug that is rare but still wasn't fixed, or something else pretty important, possibly, but if it something like, I donated for lapis, then no. To me, it depends on what kind of posts you are talking about.
It's not recommended unless it is an unresolved problem, report, or appeal. If you revive old, un-necessary threads.. staff and players get pretty pissy as all the people that contributed to that thread are notified, and revived threads commonly result in a wave of spam posts. So no, not unless it is necessary.