Reddit sidebar backlinks
Reddit is the biggest social forums in the world now. It ranked high on Google by many keywords, many niches.
I can add a link at the sidebar of subreddit as follows:
1. I will create a good name for your subreddit, such as Stock trading club (if your niche is stock trading).
2. I will add 100 members to your subreddit.
3. I will add 30 posts to your subreddit (by your long tail keywords).
4. I will add your link at the sidebar.
5. I will add you as moderator of this subreddit.