Content Distribution List Help

Im putting together a strategy for my team to do with effective content distribution, trying to limit the shot gun tactics currently used by many content marketing professionals. At the moment ive compiled a list of channels paid and free that look good but wondered if anyone knows of any hidden gems that i haven't thought of.

care to add to the list?

[TABLE="width: 64"]
[TR]
[TD="width: 64"]Zemanta[/TD]
[/TR]
[TR]
[TD]Disqus[/TD]
[/TR]
[TR]
[TD]Taboola[/TD]
[/TR]
[TR]
[TD]Outbrain[/TD]
[/TR]
[TR]
[TD]reddit[/TD]
[/TR]
[TR]
[TD]the next web[/TD]
[/TR]
[TR]
[TD]designernews.layervault.com[/TD]
[/TR]
[TR]
[TD]growthhackers.com[/TD]
[/TR]
[TR]
[TD]inbound.org[/TD]
[/TR]
[TR]
[TD]hacker news[/TD]
[/TR]
[TR]
[TD]fb ads[/TD]
[/TR]
[TR]
[TD]linkedin adds[/TD]
[/TR]
[TR]
[TD="class: xl63"]nrelate.com[/TD]
[/TR]
[TR]
[TD]quibb[/TD]
[/TR]
[TR]
[TD]list.ly[/TD]
[/TR]
[TR]
[TD]techmeme[/TD]
[/TR]
[TR]
[TD]producthunt.com[/TD]
[/TR]
[TR]
[TD]bufferapp.com/daily[/TD]
[/TR]
[TR]
[TD]forbes[/TD]
[/TR]
[TR]
[TD]entrepreneur[/TD]
[/TR]
[TR]
[TD]inc[/TD]
[/TR]
[TR]
[TD]nativo[/TD]
[/TR]
[TR]
[TD]sharethrough[/TD]
[/TR]
[TR]
[TD]vox media[/TD]
[/TR]
[TR]
[TD]Adblade[/TD]
[/TR]
[TR]
[TD]aNEWSme[/TD]
[/TR]
[TR]
[TD]OneSpot[/TD]
[/TR]
[TR]
[TD]huffingtonpost.com[/TD]
[/TR]
[TR]
[TD]contentblvd.com[/TD]
[/TR]
[TR]
[TD]gravity.com[/TD]
[/TR]
[/TABLE]


thanks
mark

Heres some more
[TABLE="width: 64"]
[TR]
[TD="width: 64"]https://medium.com/[/TD]
[/TR]
[TR]
[TD]http://socialmediatoday.com/[/TD]
[/TR]
[TR]
[TD]http://growthhackers.com/[/TD]
[/TR]
[TR]
[TD]http://inbound.org/[/TD]
[/TR]
[TR]
[TD]http://www.bizsugar.com/[/TD]
[/TR]
[TR]
[TD]http://www.reddit.com/[/TD]
[/TR]
[TR]
[TD]https://news.ycombinator.com/[/TD]
[/TR]
[TR]
[TD]http://www.examiner.com/[/TD]
[/TR]
[TR]
[TD]http://www.business2community.com/[/TD]
[/TR]
[TR]
[TD]http://blokube.com/[/TD]
[/TR]
[TR]
[TD]http://www.quora.com/[/TD]
[/TR]
[TR]
[TD]http://specialedition.linkedin.com/publishing/[/TD]
[/TR]
[TR]
[TD]http://guides.co/[/TD]
[/TR]
[TR]
[TD]http://www.slideworld.com/[/TD]
[/TR]
[TR]
[TD]http://www.slideboom.com/[/TD]
[/TR]
[TR]
[TD]http://www.scribd.com/[/TD]
[/TR]
[TR]
[TD]http://papyruseditor.com/[/TD]
[/TR]
[TR]
[TD]http://pressbooks.com/[/TD]
[/TR]
[TR]
[TD]http://liber.io/[/TD]
[/TR]
[/TABLE]

Great list!

It would be great if you could categorize them (free or paid).
There are a lot of services I've haven't hear of, and I don't know if they're free or paid.