I don’t know how recent this, but I just discovered that tumblr has made it easier to report reposts (and as you can see reposting is not okay. Just stop stealing people’s things!).
You can report people for either reposting or selfpromoting on your post
And then you just have to fill out a little form with links to the repost and a link to your original post as well as your email (so they can let you know what happens next)
Note: You can only report for posts you are the owner of – so if you see somebody else’s post has been stolen, just notify them, and maybe give them this link if they didn’t know it existed
You can also file a DMCA takedown request via this form (useful if you haven’t posted your thing to tumblr but somewhere else on the internet)
Please reblog this so we can make tumblr a better place for creators, not the lazy reposters!