But I can't be Sherlock Holmes
Aside from the fact that it would eat my life, I think the problem with me getting a Tumblr is that I would completely overthink it. I mean, the world is full of beautiful time sinks. I'd have to go through a lot of them if I were going to represent accurately the spectrum of things I find attractive to look at or interesting to think about. I don't have the time for that. I'm engaged in a job search. My free time, what there is of it, will drop spectacularly if I'm successful. The last thing I need is to get stuck into a new social media platform that requires me to spend even more hours looking at things on the internet. I keep away from Twitter for similar reasons: I am an obsessive person and I already stay awake until four in the morning writing about things. Also I do not think I naturally generate witty tags. This train of thought brought to you by the couple of people recently who've asked if I'm on Tumblr and this photobombing blowfish.

no subject
I've so far avoided getting a Tumblr for similar reasons. It's bad enough a timesink just when I start reading someone else's Tumblr and following the links.
Best of luck with the job search and all else.