If you choose to post the joined photos to Facebook or Twitter directly from PhotoJoiner.net or through our apps, and give us permission by connecting through Facebook or Twitter, then we get your email id from Facebook/Twitter and we store it in our database to keep a track of how many users are making use of the feature. Your email is not shared with anyone. We will never send you spam or any unsolicited emails. If we ever send you an email, it will come with an unsubscribe link so you can remove yourself form our list.
That's pretty much about it.