Last night, Facebook CEO Mark Zuckerberg wrote an open letter to the Facebook community announcing the site now has 350 million members. He also outlined several changes that will affect Facebook in the near future. Considering Facebook’s history of changes (and the way some members invariably react as if the sky were falling), giving a little warning in advance is probably a wise strategy.

For the most part, the changes sound positive to me. For example, Zuckerberg points out that when Facebook launched, it gave people the opportunity to join regional networks. This was just one way to locate your real friends on Facebook — you could browse your region and see who else from your neck of the woods was online. But as the user base has grown, these regional networks have also seen membership numbers increase. And because you might not want everyone in a given network to be able to see your profile, Facebook executives have decided to nix regional networks.

In addition, Zuckerberg says that users will have more control over who can see their content. Part of this initiative includes simplifying the privacy settings options. Click through to learn how the changes might affect you.