Facebook is fun, but low on content. OCLC's Web Junction had content, but was focused on public libraries.
Good news! WJ now has a section for academic libraries, for special libraries, and archives and museums. Now there's a chance for connections between different institutions for collaboration and just getting to know one another.
My Preservation Group is growing, and all are invited to join it. I'm slowly getting some links into the Archives Section, and will be adding to it. Right now there are links to preservation handouts, book repair videos, and disaster plans.
So if you want to meet other archivists and librarians online without the Facebook Fluff (R), check out WebJunction. The more of us who join, the more useful it will be! You do have to join, but it's free and spamless.