When you hit the "Like" button out of a thread you're given a option of "Adding the op", "Like this post" or "Like this forum".

Now I know that "like this post" adds that thread to the list of my favorites page but what does "Like this forum" do?

I've been liking posts of threads I like for an easy reference page of my favorite models but with post deleted or posters that are no longer members I find that models on my reference page just disappear.

I've tried the "Like this forum" but can't seem to find the diffrence.