Things tend to blow over very quickly, I think because it's so hard to carry on a coherent conversation over there. By the time you find a meta post, the OP has already posted a gazillion other things and it's almost not worth commenting. It's not as easy to find wank as IMDB, but usually if you hear something that you know is bound to cause wank somewhere, all you have to do is look up the respective tags and you'll find it.

This is a really good example of what a large-scale tumblr wank looks like: http://www.journalfen.net/community/wank_report/1488.html?thread=8588752#t8588752

(Though it's not hard to find Sherlock wank because the Sherlock fandom apparently does it non-stop.)