Why would they want to be in it?

Well, it seems like if the biggest social network is initiating currency project then rather have a foot in than out, no?

More broadly, it seems that yet another media campaign to push Facebook's bowl over somehow is going on. Not a fan of the company by any means, but it does look like this project has merit and will happen whether the naysayers want it or not. Given this I would just assume that any big tech company would like to participate with their knowhow.

And yes, maybe it won't succeed, but it's hard to see how it wouldn't. I guess the regulators are the biggest possible obstacle.

facebook would not want to invite google, since facebook's biggest competitor is google (advertising wise).

Agreed. Seems Google would throw 10mil at a project like this as a tax write off, if it was allowed in...another example of how this isn't now nor ever going to be decentralized.