STOP FREAKING OUT ABOUT IT! Nothing has changed. Tumblr is adding/improving things they are legally inclined to do. They are required, by law, to have the ability to block NSFW material at the users request because the site is available/made for people under the age of 18.
See that right there? You can uncheck that box and, like magic, you can look at all the porn you want again. Blogs won’t be blocked, posts won’t be blocked, noting will be blocked. Still blocking stuff? Tumblr did change the way it works to better filter out NSFW material for those you do want it blocked - expect issues. They said they fixed it so calm down.
Remember this post? WELL IT’S NOT TUMBLR’S FAULT. Apple, restricts content in tags like that. If you’re angry about that, then blame Apple! Take a look at Sections 16-19 in Apples App Store Guidelines - because sections like that are known for explicit content (and even if you don’t see it as that, it’s still labelled as that) Tumblr is required to have those return no results (or “block” them) unless they want their App(s) permanently removed from the App store. I’m not going to get into details about it, but Apple has had numerous cases of things like this and all the apps were either removed or changed to fit into Apple’s terms.
Why doesn’t this happen for Android users (like myself)? Because Google doesn’t restrict that kind of content.
Seriously, everyone just needs to calm down about it and actually do some research before jumping to conclusions. None of this is because of Yahoo. All Yahoo does is basically host Tumblr - they don’t change anything.
The people at Tumblr are doing the best they can to make it a happy and safe place for EVERYONE - that includes the people who don’t want to see NSFW material. Mistakes happens, changes happens, and they still need to abide by the law.