Yeah, if the thread is something like "The What Will You Eat For Lunch Tommorrow Thread," I think it is perfectly fine to bump it up and start it up again. If you have something to contribute, it's OK. However, you may have the answer to some question someone asked 8 years ago like, "What Do the Snowths Look Like?" You may be able to help, but in the past 8 years, there's a pretty good chance that with Muppet Wiki and the forum the person already figured it out. Therefore, even though you are contributing, the answer is still 8 years late. The only thing is, though, many times I don't know if people realize how old the thread is, so LOOK AT THE DATES ON THE THREADS.
Here is an example that I encountered the other day:
I clicked on a thread, with a recent reply called, "Who is the Hugest Muppet?" I looked at some of the most recent comments, and a bunch of people (including Beauregard (you're the one I remember)) didn't know who the Bossmen are. And I was thinking, why don't these people just time in Bossmen on the Muppet Wiki page and find out who they are. But anyway, I decided to go to all this trouble to put on a picture of the Bossmen to show who they are, then, right before I posted it, I realized the people didn't know who the Bossmen were in 2002.