Truth is if this was Nintendo or MS buying them the picture would look a lot more grim than it is now. I haven't yet seen FB mismanage any of their acquired assets, not to say I have faith they won't, but at least it's open to discussion what its future will be a few years from now on whilst we all know what would happen if either of those two got their hands on this.
This hysteria is completely unjustified and just brings our own criticism of facebook, the site, not the company. They are newcomers in the hardware business, as was Google when they released Android, which received fairly similar fears of an Ad riddled OS, all unjustified and exaggerate.
Calm down and smell the flowers, this just got a lot more interesting.