Google+ had terrible marketing and release, but it had some decent ideas that I wish other networks had carried over. The idea of "circles", where you had a circle for "acquaintances" "friends", "family" would be great on, say, Facebook, as it would allow me to filter down my feed to just the people I really care about but still have a connection to more distance acquaintances. Currently on Facebook the news feed is…
For most of the posts users would make, users would probably spend more time thinking about which circles to enable than actually writing the post. It's a headache and it leads to a poor experience, it feels like a hurdle, something you must do; it makes posting less natural.
Facebook on the other hand offers the same functionality but it's "buried" so you can use it at your convenience.