Sometimes I will use the site search for something that interests me. When I find a thread that is interesting to me and read through it, I want to comment... Until i notice that the last post was from (let's say for demonstration purposes) 2009. Is it frowned upon or not allowed to revive it because of how old it is? I don't want to be one of those guys digging up old threads if it is annoying to other people. What do you guys think about reviving an old thread? How long is too long?