I've blogged about the subject before - and I consolidated my thoughts for B2B Marketing site Paulwriter.com on Talent Communities - 5 steps to to building an Employer Brand
To read the article you might require to sign in to the site - but it's free and you should do so - if you're a B2B Marketer
The two objectives organizations will need to start thinking about are:
How to Build an employment brand that is relevant to the needs of the key talented people and to monitor the conversations on the social web to understand how to join in the conversation
Understand where these talented prospective employees are, what they talk about and how to engage them to attract them to consider you an employer.
Organizations will need to move away from building their presence from social networks and integrate them to build online communities for their talent pool.
To read the article you might require to sign in to the site - but it's free and you should do so - if you're a B2B Marketer