Tolkien Tumblrs
 

I know a few Tumblrs that almost solely post Lord Of The Rings related blogs.
peregrint
fellowshipoftheringers
ladyofrohan

If you know of more, post here. A lot of them are really well done!
Sure they are based off the movies sometimes, but some of the post gif from the movies with quotes from the books.

These look interesting. It looks like there is some movie news on some of them as well.