Here's how to form a tag team using social media:
(1) Tap "Form a Tag" in the upper right of the Home screen, then select "Invite Via Social Media".
(2) On the next window, select the social media app you want to use.
(3) Use your selected social media app to send an invitation to your desired Partner.
(4) Return to the game and wait for your Partner.
*Your friend can accept your invite and become your Partner even if you are offline.
(5) If your friend opens Fight Leage with the link you sent them, a Partner confirmation message will appear on their screen. Tap OK and you can become Partners.