Tried any of the the 3rd-aprty FB & Twitter apps yet?
For FB there's fMobi, & Sociality's coming soon too apparently.
Twitter I can't recall OTTOMH, pretty sure there's at least one that's good.

Try browse:
http://n9-apps.com
http:/my-meego.com
http://apps.formeego.org (still very early stages)
And of course the Nokia Store.