In the comments of one of the links there, someone suggests adding Circles to the post, even if it's already public, as a way to simulate hashtags. I like that

In the comments of one of the links there, someone suggests adding Circles to the post, even if it's already public, as a way to simulate hashtags. I like that, but the problem is that nobody else can see what circles you published to. (Which is probably how it should be, so they can't figure out how you've organized people. It's a privacy concern.)