They’re crashing because they got fucked by Apple on targeted ads (their cash cow). They put themselves in a position to get fucked by Apple because so far they failed to become an OS/hardware company.

Why do you think they’re pushing for VR? To push the adoption of Oculus headsets. They failed with the Facebook Phone so now they’re thinking : whats the successor of smartphones ? VR headsets. It’s why Microsoft is betting on it as well

It’s a rational decision. Execution is another issue though