If I were a recruiter would I.....
.....BLOG?
Here's how I see it now. If I were a recruiter I would want my company to have a recruitment blog to help with SEO, company updates, general recruitment stuff etc. Otherwise you end up with an award winning set of blogs a la PwC i.e. one or two posts a year from their young bloggers who do not appear to have the time, inclination or incentive to post more often.
Whereas, give a recruiter a Twitter account and it is easier for them to maintain and allows them to update candidates about specific recruitment activities they as individual recruiters are working on.
Blog = company. Twitter = recruiter.
Both = better SEO and conversations.