For a while now people have bypassed Facebook's API restrictions for chat and news-feed by using the "mbasic" webpage version. It's pretty trivial to get around most of their API hostility. How long that'll last I don't know, but it's a pretty important service for connecting people in places with very low bandwidth.

But... That said, building one decent chat app is a massive time sink in itself. Then do this for many different popular apps with massively varied features (Google maps, Uber, etc) - then build that all into Android, then build the hardware - this phone isn't going to be released for years.

Note that it's a pre-order and not an order, it's just not ready yet and likely will never be ready at their price point. They'll get less backers than they expect, burn through the cash faster than they want and will struggle to meet their promise. As other comments have points out, they're better off starting with lower expectations and a website people can use. That's all just assuming it's not a scam.