I've never been on g+ and fedbook carded me in '12, then locked me out of my account of 7 years, soooo, they can jump in a lake, afaic. http://facebook.com/proclaimation

I don't see any problem with 'noise'.
You get to build your first group by subscribing.
Do you subscribe too many authors you don't like?

Hashtags are groups, did you not find yours?

Groups are going to happen, it is just a damn shame in my book, those people will never have a chance to stumble upon the message that could solve their most pressing issues because they would rather escape into cat videos and forget for a little while that their apathy is murdering children worldwide.