I do love me some Overwatch! However, Empty Closets has some rules about swapping off-site contact details like Battletags. You have to both be Full Members and swap your details in a Private Message. To become a full member, you have to be a member for two weeks, have at least 50 posts, and apply via the form found on the main page of the forum. This is just something we do in order to protect our younger members.