There is a lot of crazy here - either crazy reporting or craziness on the part of Facebook to think about an acquisition at this stage. I'm guessing the former based on experience reading the tech press.
A lot of people have looked at this problem for decades (heavens - I did in the early 90s), but the proven tech isn't around and it isn't clear the model even works. You can do serious proof of concept for very little money - an early acquition would be very odd. I suspect someone at FB may have made a contact checking into the current state of the art and a game of telephone ensued..
I was in the Phoenix area a few weeks ago and saw some elaborate displays. The winner had its own roller coaster that appeared to be made from irrigation tubing. It was temporamental, but the guy gets style points. Many of these displays probably tens of thousands of dollars - I didn't see one I would call artistic.