It occurs to me that I've been spending far more time on tumblr than on lj or dw recently. That's likely to swing back in the near future, but I see on my flist/dwircle (I hate that term) that some of you are starting to jump on tumblr. So, if you want to find me, here I am:
What you're likely to find there:
All things Sherlock
Downton Abbey stuff
The Hobbit stuff
Mark Reads/Watches stuff
general fannish glee
lefty liberal politics
photos/gifsets of attractive celebs being attractive
eye-rolling at stupidity
cool shit I find on the Internet
occasional gifs I create
and other awesomeness
So, basically, what you'd find here, except it's often there instead.
The thing to know about tumblr is that it moves much, much faster than lj -- people post eight, nine, ten times a day. So if you're just looking at one tumblr (e.g. mine), you might see like, five posts in a row about basically the same thing, because that's how conversations are carried out on tumblr. It's unwieldy, but that's how fans have decided to use it.
(Tumblr skews younger (MUCH, MUCH YOUNGER), so there are occasional "please stop making me cry with your ignorance" posts, but by and large it's a good time.)