We do not share personal data however we may use facebook id's and the associated user's name for maintaining high scores tables.
The data stored is the user id, the user name and the score, we don't store anything else such as email addresses or location.
We may obtain a user's friends who are also using the given app for the sake of displaying high scores for their friends but we obtain this on the fly via facebook calls when authorized to by the user. We do not however store or maintain this information on our database.Additionally we may obtain the actively logged in users profile picture to display within the app, but again do not store this on our database.
In breif we only store the bare minimun required for high scores tables.