The first focus groups were created at the Bureau of Applied Social . The term itself was coined by psychologist and marketing expert Ernest . A focus group is an interview, conducted by a trained moderator among a small group of respondents. . groups - one or more client representatives participate in the discussion.Like other forms of Internet marketing, marketing a small or home business on LinkedIn . your account updated, you can get the attention of potential clients and customers. Join groups related to your business and your interests and participate in . Social Media Marketing; How to Use LinkedIn To Promote Your Business..........social advertising

That will tend to be a labor intensive promotion method with less opportunities or profit expanding automated techniques like some aspects of SEO. Writing skills and a social knack wold be important qualities, to earn more than a moderate wage you would probably have to outsource a significant part of the in the trenches work with freelancers from marketplaces like elance, odesk or freelancer.com
A web search for: social media marketing service should get you lot of examples.
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I don't know many companies does that. but social marketing is a trend of marketing these days. I think your company will make money if you can market yourself well.
I want to open a company that will be all about social media marketing. I have a small circle of clients. I want media management like Facebook, twitter, Pinterest etc. can you guys tell me any such working and successful company or group?