One of the key areas around defining a Social Media Recruiting Strategy is the ability to determine where the right audience is. You might want to consider issues like: who are your candidates and where are they? Knowing who your candidates are is probably the easier part.
They may be categorized by the skills they possess and experience in that domain. For some Gen Y roles, this may also be segmented into what Universities they attend, academic backgrounds, where they live, grades and experiences while studying.
Social Media Recruiting is growing in popularity this year. Conferences like 
Twitter 
Facebook
