Yes, JFBConnect supports the older 2.2 all the way up to the latest (2.8, I believe). We always fall back to the oldest version available by default, which usually has less restrictions. You won't notice any difference though and when 2.2 support goes away, JFBConnect will automatically switch to using v2.3.
I hope that helps explain, but if you need anything else, please let us know!
Thanks,
Alex