Reddit and Hacker News are rather content aggregators rather than social networks. Google+ and Twitter have the same issues than Facebook on these specific issues. LinkedIn is a bit too specialised for professional messages and they too like Google+ and Twitter don't have a great track record concerning privacy and abusing their position.

Reddit may have started as a content aggregator, but there are plenty of subs that mostly or only have original/self-posted content. talesfrom*, various hobby groups, support groups, crowd-sourced advice columns like legaladvice or relationships.

It's well past being solely an aggregator.

None listed by you come even close to what Facebook offer to majority of users. Linkedin is work environment and people wont go personal there, Twitter is just status update thing that really tries to become something bigger but fail to see what people outside their user base want and Google Plus is a joke - I am to this day surprised that they created it as Facebook killer, not as LinkedIn killer since obviously it is corporate style network, not a place where you go after the work, relax and see funny pictures.

Same thing with Google Buzz before.

Do actual humans still use G+ and linkedin? I thought they were mostly just playgrounds for bot-wars.

Back when I played Ingress, most city-level activity was coordinated through private G+ communities (with neighborhood-level activity being done in Hangouts group chats), and the more social stuff (i.e., the stuff you don't care about keeping secret from the Smurfs) tended to happen in public G+ communities.

LinkedIn is a good tool for viewing someone's public resume, though I don't regularly log into it. Every once in a while, I'll log in to check out how a previous employer is doing (e.g. see which of my ex-coworkers are still at the company, what new positions have been created, etc.). I still have dozens of unanswered connection requests from recruiters, though (I don't accept people I don't know), and the site has gotten progressively spammier over the years.

Did you mean: twitter?

Joking aside I almost never get followed by spam accounts on g+, weekly or more on my English speaking twitter account.

- Google plus: that would be kind of pointless, wouldn't it?

- LinkedIn: The worst of the worst ... :D

- HN / Reddit / Twitter: How do you share pictures privately with friends? (to name one necessary feature)

You could have a private subreddit I guess? Still super clumsy compared to FB.

Further, HN/Reddit/Twitter etc. each only have a subset of my friends. ALL of my friends are on FB.

> How do you share pictures privately with friends?

Flickr. Some of the holes in the group management are a weakness there (no albums in Groups, for example).