It's a share/retweet campaign to celebrate the #FEHeroes: Voting Jubilee event. All players can get up to 5 Orbs and 150 Divine Codes (Part 1) based on the total number of shares and retweets!
https://fe30th.special.fire-emblem-heroes.com/en-us 
• Facebook and Twitter are not sponsors of this promotion.

10,000 shares/RT: 1 Orb and 50 Divine Codes (Part 1)
20,000 shares/RT: 3 Orbs and 100 Divine Codes (Part 1)
30,000 shares/RT: 5 Orbs and 150 Divine Codes (Part 1)
Campaign period:
Apr. 5, 9:00 PM PT to Apr. 12, 8:59 PM PT
Please see the in-game notification for more details.