They do not both build upon faster-rcnn. Deep mask is a pretty different paradigm - it makes mask proposals (instead of bounding box proposals) and then refines them using sharpmask, and it doesn't work as well as mask-rcnn in terms of mean average precision. Mask-rcnn just adds a branch to faster-rcnn that roi-pools the bounding box predictions in order to predict masks.
Elon Musk and Mark Zuckerberg have both warned about the threat of AI and also invested in Vicarious. Vicarious announced they broke captchas 3 years ago, so presumably this is research from then. I wonder what they are up to now, and if it has any relation to why Elon has been especially vocal about dangerous AI recently
Where's a reference for Facebook's storing long term everything you type in the comment box? I am skeptical of that claim. Having previously interned at Facebook, I got the impression that Facebook actually takes user privacy really seriously, and I'd be super surprised if they were doing something creepy like that. I know for a fact they don't use any personal message data for advertising, they were really serious and open about that.