I think you should be able to use the mobile versions of these applications. An example is m.facebook.com You can use the Internet Browser (In Options get to Applications > Browser > Default Browser Configuration > "Internet Browser").
However, I have no idea about the APN setting. I assume it can be blank, since you're not using a carrier, but I will watch for anyone more knowledgeable to answer.
If you want to use the RIM supplied apps you will require a BB date feature at minimum. Without it you have no data connectivity to the BIS which is needed.