11/18/2013 Update: Important: The WSU Libraries migrated from WSU WorldCat/WorldCat Local to Search It/Primo in mid-December 2013. Griffin and WSU WorldCat links will no longer work, and if you have a WSU WorldCat account you will still be able to see your saved items if you log in to Open WorldCat (www.worldcat.org), but saved lists and saved searches in WSU Worldcat did not transfer to Search It (although Search It has something similar: see the EShelf). You can still see and search WSU WorldCat, but you'll see it is not fully functional  - click here. Summit is still functional; you can find it here.

You can follow WorldCat.org on Facebook, or install the WorldCat Facebook app. Like the iGoogle app, it will search WorldCat.org, not your specific WorldCat Local catalog (unless you create your own application).

Consider also using something like the MyHTML Facebook app to add in a list or keyword search widget to a box or your profile...

Do a WorldCat Local search from Twitter, get the results in a link, retweet it to all your followers: it's all here - and you can also follow WorldCat.org on Twitter.