I've been implementing a facebook like button with faces today. A couple of things gave me issues:

1. If your facebook like button isn't appearing then check that you haven't got chrome Social Auth Disconnect running - it blocks like buttons
2. If you have faces on and they are wrapping, then you might been to adjust the width of the like frame by one pixel until they wrap correctly. I wanted 300px, but ended up having to go with 296px, otherwise an extra face appeared and wrapped. Annoying.
3. We are using the fbAsyncInit functionality. It doesn't seem to work when I set an app id. Removing magically fixed everything. So, I either have our app id wrong, or i don't know what else it could be. We used to have like buttons on quite a lot of pages and they recently stopped appearing, I believe because the business that runs the site actually changed their page into an app, so the ID changed. I tried the new ID and it still didn't work. On whim I tried removing it, and it all worked again. We only are using the Like social plugin functionality currently and the app id doesn't seem to be required for it at all, so I've just left it out until we do need it.

Fun times.