manicmagpie answered your question: Goddamn, 20 new followers while I was asleep....
Tag your posts? Ie, add hashtags to the gushing amazon of things I spew forth?
Mostly just referring to fandom posts, things like 'anime', 'supernatural', 'sherlock', not so much art posts and scenery posts, which is what a lot of your posts are. I use TumblrSavior, since I don't like every single thing the people I follow post.
As it happens, I do like your content, you just post so often (gushing amazon indeed!!!) that it would overrun my dashboard, which I like to be able to see every post on. I am aware of your existence though, and have visited your blog more than a few times :)
While I'm here, though, tagging is a wonderful thing because it gives you the ability to find any post (that was well-tagged) on your blog in a matter of seconds, or simply just browse your posts on one subject easily. /tagged/game-of-thrones-gif, on my blog, for instance. Just in case anyone was wondering if there were any benefits to tagging other than helping out other people.
IDK, I'm obsessive when it comes to tagging and cataloging and organizing things, but it really does make my life easier. I'm also the type of person who organizes the folders on her computer to an extreme extent, though, so...your mileage may vary.