reblog a few of your favorite gifsets from that, and then check out the blog suggestions that come up in the right-hand sidebar. When you reblog things from those sideblogs in your dash, it'll give you even more suggestions. I have found most of the sideblogs I'm following that way.

That does sound neat, but I use xkit to block the sidebar suggestions because they were usually so off. /o\

Sideblogs! I don't know why I never think of those. Maybe because a bunch I did find seemed to be dormant....I really didn't look as hard or thoroughly as you're suggesting, tho. (I find both Tumblr and Twitter kind of overwhelming in their endlessness. You can't ever get to the end, there is no end to get to, there's no way of being caught up really.)