Image theft and uncredited content

This is becoming an increasingly common problem for artists all across the web: Work being reposted with the credits removed. Here's the sad story of an artist who's comic strip went viral, but she got almost no benefit from it because her URL got stripped out:

http://mixtapecomics.tumblr.com/post/68277854434/after-a-discussion-last-week-with-several-of-my

I know I've done it, and you probably have too: You see a cute comic or a cool illustration on Tumblr or Facebook, and you hit "Share" without thinking much about where it originally came from. This is a good reminder to try to find the original source for such images (Google reverse image search FTW!) so the creator gets their props.