But Dreamwidth had newsletters as did LJ. Unlike Tumblr, we have the choice to lock posts, so I actually think linking public posts should not require the OP's consent unless there are clear indications that this would invade their privacy or cause them undue stress. (My own judgment used to be based on the poster, i.e., did I know they liked conversations, on the amount of discussion already in the post, on the size of their flist, and on whether the post was a pure meta post or contained personal stuff as well.)

I feel like the ability to lock and also the ability to just say, never link me, should be enough (yes, that'd mean that linking is default and you'd have to actively opt out, but this is the internet and even archive.com isn't respecting robots and spiders any more...which horrified me when i found out!)