I'd like to integrate Facebook login options to my SMF forum, however there are some questions I couldn't find the answer for.

1) Can existing members link their forumaccount to their Facebook profile? I don't want to end up with hordes of members creating a doubled registration. If yes, can they choose their method of login (regular or social)?

2) What happens to the accounts created with the mod when it is uninstalled?

3) Can this mod be used with custom themes?

4) Is the purchased license valid indefinitely or does it require annual payments?

Sorry for the many questions

1. Absolutely, right from their profile they can add all social accounts and link them with their current user account. 

2. Nothing, they can use the forum even if the mod is uninstalled. 

3. Yes, it can be used with custom themes. 

4. The license is valid forever, you can pay $15 to get one additional year of updates and support, but you can ignore renewal and keep using the mod. 

Sweet, thanks for the swift reply!

Glad to help  

Installed and configured without a hitch 

I'm really glad! If it's possible you can spread the joy here: Feedbacks - Page 1 of 4 (it gives you 20% OFF on your next purchase!)