Okay. Here's a thread for your Blizzard BattleTags.
BattleTags are the name and hash tag with four numbers, not the email address (that's Real ID with real names). It's usable across Hearthstone, World of Warcraft, Diablo III, Heroes of the Storm, Overwatch, etc.
As an example, mine is Nami#1205.
Just post yours here and I will maybe make a list?