This is so true, especially about being an active member of these communities. If you're not going to be active, then don't even bother. The members won't trust you and you or your sites could even get banned, if the community sees you as a spammer. Excellent read! How to Commit Social Media Suicide Here's part of it that I found important, but the rest is well worth reading.
Thanks for the post, should be a good read If you are using social media for promotion, it is a swell idea to make friends and stay on their good side