No matter what, the very first piece of Social Media Real Estate I'd start with is a blog.
Social media puts the "public" into PR and the "market" into marketing.
Between your brain and your mouth (or your fingers) is magic: your power to choose what you say next. Use that magic.
There's no value to working hard on being really popular.
Ideas have a shelf-life. Share yours, let others collaborate, and you'll get new ones.
Surrounded yourself with brilliant people. You can't HELP but grow when that happens.