But seriously now, media are evolving no matter if we like it or not and new forms of communication do appear. There is also a website, but the team that runs that is not as active as the Face book group.
Basically Facebook is a fast and easy to maintain media with a limited amount of volunteers and thus it had appeal to the volunteers that wanted to do some promotions and distrubution of information. At some point I wouldn't be suprised if Instagram, twitter alweel as newsletters and whatever else will appear. It all boils down to what and how many volunteers can you get and what they are willing to do/ are most comfortable with..
If there are people that have the skills and time to do other media they can always contact me/us privately and we can discuss options. firstname.lastname@example.org