PrettyGamer
I Love YTtalk
I registered there but I only look there to get better keywords for my video tags or even title.. I learned it in one advice of becoming better in SEO.. 

And also "How can I become a respected member of their community and contribute to the site on a regular basis". That will not only help you learn what kind of posts do well, but also it will remove the stigma of self promotion when you do happen to post your own stuff. People won't be turned off by it if they see your name often.and ask yourself "How can I help these Redditors?" or "What do they like, and how can I give them more of that?"
It is all dependent on the type and quality of the content you're posting. Post a let's play and it doesn't matter if it's the best let's play the world has ever seen, you will be downvoted because people will assume they've seen it all. But, take one crazy ridiculous kill (there was one recently of a guy who ejected, sniped the guy out of the plane following him, and then landed in that guy's plane) and convert it to an animated gif, link to the video in the comment section, and you will get views regardless of if people think it's self promotion. If the content is compelling enough no one will care. The thing is, 99% of the content posted there is not compelling enough.I can tell you by experience that, unless you have a fanbase in your particular subreddit where it can easily post your creations for you whenever they're out and upvote your posts, you're going to have a hard time self-promoting.