There's no magic bullet when it comes to social marketing. While there are defined best practices, the best solution for you may be different than the right solution for your competitors.
Our managed solution starts at $500, although we can definitely help with the other two as well depending on your company vision.
Approach #1) The managed solution
Pros: Content is consistently generated, set management fee, ROI is calculated, managed one page report for you the review with monthly meeting
Challenges: Retaining that "insider" feeling
Approach #2) The consultant
Pros: Everything's managed by you
Challenges: Dedicated internal resources to generating content, calculating ROI, ensuring new campaigns are launched and running, coordinating your blogging efforts in a technically savvy (SEO) way
Approach #3) The community
Pros: High enthusiasm, hyper-dedicated subscribers
Challenges: Must become a destination, you're competing with sites like Facebook. Requires extensive resources to maintain and consistently deep compelling messages to keep users engaged