IMO there would really be no point in having this forum if there's also an "official" Facebook group. Facebook users would migrate over there and the forum would become even quieter than it has been already since FB's popularity increased. People who don't want to use FB are then left behind.
It's also important to me to not give over everything to the Zuckerberg empire. Here on ODO you don't have any ads, you are not being tracked other than in terms of forum functionality (whether you are logged in, have read a particular post or not, etc.), and you can rest assured that all data is hosted on our own secure server that resides here in the US and cannot be accessed by any third parties. Nothing is being shared for any purposes, and if there's a request for removal, all you need to do is PM me.
We are still waiting on a software update to improve forum functionality, especially for mobile devices, and that will be implemented as soon as it becomes available.