I don’t know if this qualifies me as old, but when I signed up for Facebook, only the emails of certain domains applied. Most of these were colleges, but there were a few companies and other organizations. The site at that point was largely geared toward learning about people in your network — for examples, sharing settings were less restrictive for those in the same network as you.
Funny, then, how Zuckerberg et alia would circle back to its original model of intra-network social profiles.by introducing an “at work” version of Facebook. I was very skeptical of the announcement at first, until I remembered that this is what Facebook was built to do in the first place. Just as Amazon and Google have respectively looped back to books and search, it seems like Facebook is trying to herald its past as a more restrictive social network.