I think a lot of users would love to be able to integrate facebook smoothly in their Android and iOS (and 'insert other OS') games.
The way it's done now, as far as I know, is trough cocoonJS with the help of ClayIO... so you have an extra login to do. A messy, difficult workflow which a big part of the Construct 2 users struggle to accomplish (myself included). And a negative impact on revenue.
Would be so good to have a smooth way to do this from inside Construct 2.