It appears that the CEO of Niantic, John Hanke, has had his Twitter account compromised. The twitter account began tweeting odd references to Quora and the hash tag #OurMine within the last hour. It is unclear if this is some sort of response to the recent API changes, account bans and updates to Pokemon GO this morning or just an opportunistic compromise.
— John Hanke (@johnhanke) July 31, 2016
We will update as we know more.
Update 4:02pm: It appears that it was a Quora account that was hacked with autoposting to his Twitter account.