I use Tumblr occasionally and I like it just fine. Some pretty good info and Gifs there that I use. One thing I like about it as it seems to be mostly secure and safe. Rarely does my AV say there is any risks.
There are a lot of interesting gifs on Tumblr. I found some blogs where I find the photos of some kings and emperors.
I think that I looked occasionally, also into information or videos there, but I visited more often YouTube and other, similar sites.