You could get about 1 click from 20 posts in un-moderated groups. You could also get 10 clicks or a few sales from a short reply to a post where someone is looking for the products or services that you offer. You just need to find those posts. Here's how. 1) Find about 50 groups somehow related to your niche. You're only interested in the groups that have 50 or less posts a day. 2) Use a list of keywords (for every aspects of your products/services in details) to monitor the groups. You'll need a tool and search engines won't work for closed groups. 3) Help the members by answering the question with your link. After a while, you'll accumulate a list of FAQs for your niche, and you'll be able to have an insightful posts in a minute.