I can't speak to the particulars of the Facebook games but here are a few things to keep in mind:

The Vox is definitely intended to be an ereader. As such, the processor isn't going to live up to everyone's standards for web browsing, watching video, or apps.

You may need to try out several web browsers to find one that works for you. I've found that the supplied browser works for some sites, while opera works for other sites.