Find groups to post to in social networks

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Job Description

Seeking someone with experience researching groups on social networks.

I need to locate the largest groups on Facebook, Linkedin, Twitter, Tagged, Myspace, Pinterest, Foursquare,

Looking for groups with lots of families and senior citizens.

Want someone experienced in this task. No Inexperienced applicants!
I need alot of groups.

Skills: facebook, linkedin, twitter, myspace, pinterest, foursquare