is there any mod for same? am ok if free/paid - but need something that works!
The free version does not work with MyBB 1.6.9.
^ nice to know that you are working on a free plugin (free like Sun Shine) for facebook connect.
Just to let you know, I'm building up the plugin partly basing on Nayar's one and I've just found a CSRF vulnerability into his plugin. Basically you can login exploiting the fact that the plugin is querying for an access token but it doesn't check whether if the request is coming from the user itself, as noticed in Facebook SDK Reference.
Thanks to Facebook PHP SDK I'll be using this high risk vulnerability issue won't exist.