This is the solution to stop the tumblr hack.
If you did click the link and got your tumblr hacked (don’t worry, a lot of us did it, of course we all want to know who likes our blog and actually visits it, have no shame) then you have to:
Go to settings
Go to apps
The ‘whosawmyblog’ app that you allowed to use your tumblr, well, revoke the access and they will no longer have any power over your blog, hopefully :D
Hope that helps!
Oh, and try to get this message around, hopefully we can get this stupid virus out of our tumblrs!