Recruiters tend to dip their toe in the water and flirt with the latest sexy tools although in some cases they shy away because it all looks a bit too hot to handle. Everyone seems to be in bed with the job boards but then they are just a bunch of media tarts really.
Google is a bit of a geeky looking type that's hotter than hell if you spend some time getting under their skin but most think Facebook and Twitter look sexier but just flirt with them and never take it any further. Fickle lot these recruiters. But one night stands rarely live up to expectations and short term affairs are just a bit too risky which is why most just go back to hum drum job board land. Some recruiters do of course get their kicks from their job board and are happy to stay where they are but some are not yet they just won't take the plunge and try something more than just a dip in the water.
If you are going to flirt with SEO, Adwords, blogs, Twitter, Linkedin, Facebook or any of the others can I suggest you go into this with long term in mind. Campaigns are fine as a one-off if you can get by with these but building a talent pool, or a community, or a Linkedin Group, or SEO, or Google Adwords need more than one night. Enough said.