Both Facebook and LinkedIn have the capability to pull in a feed from an external website. On facebook you can accomplish this via the Notes application (see it here: import a blog ). For LinkedIn you will need to install the wordpress application (find it here: WordPress LinkedIn utility).
I’ve enabled this capability for this blog to help feed the content updates to the various social networking sites. Hopefully this will be a time saver and another incentive to write and post more regularly.
(I am also testing a few of the WP -> twitter plugins. I’ll post on that topic if I get that working)