Thanks, Allison. Well said. I would respectfully add a bit to your comment that Facebook is not used by many Birders. For example, the Colorado Field Ornithologists, offers both COBIRDS and a Facebook page: the COBIRDS Google Group has 1,686 members while the CFO Facebook page has 2,947 members. I suspect there are many birders who follow both of these valuable (but different) sources of information. My impression is that this same pattern is true in many states/provinces as well as national birding organizations.
Lest anyone think I'm saying this is evidence of one medium being somehow better than another, I don't believe that at all. I do think that more total people are reached by having multiple avenues for communication and this is overall a good thing for the birding community. I also think that every communication medium offers different advantages (e.g. print journal vs. electronic, Google Groups vs. the old phone trees, texting vs. email, texting vs. phone calls, Facebook vs. Twitter vs. Instagram, and so on. This is why multiple communication methods can and will continue to successfully co-exist.
Here are some additional Colorado-related Facebook pages and their memberships (in Facebook, it's not really a membership but these are the numbers of those who have formally "like" or elected to "follow" a particular page):
Birding Colorado - 2,007
Colorado Bird Photography - 4,205
Adventures in Colorado birding for Amateurs - 91
Birds of Colorado - 373
Big Year Birding in Colorado - 110
Denver Field Ornithologists - 773
Audubon Society of Greater Denver - 2,077
Colorado Rare Bird Alert - 255
Each of these pages has a somewhat different purpose and, again, I suspect there is a lot of overlap in these numbers.
Carl Bendorf
Longmont