The best method for social marketing is avoid Facebook like a plague. The amount of spam traffic it will generate is fantastic but as for real people in your office, not much. If you are looking for a single social network for a business page I would recommend G+. Not only will it serve a similar purpose to what you were hoping to achieve with Facebook but it will serve to improve your local Google directory results and it couples really nicely with a Google ad campaign. If you are looking for shell likes from India Facebook is your tool. If you are hoping for real bodies on the table Google is your tool.