The preparation period is over and there's no going back. Facebook just announced Timeline will be a mandatory change for everyone in "the next few weeks." In a terse blog post update, Facebook says "everyone will get timeline. When you get timeline, you'll have 7 days to preview what's there now." In case you haven't been following Facebook's Timeline news, once it's activated, you have seven days to tweak your new profile, change settings, and adjust images before it's visible to other users. Get started at Facebook's Timeline page — we recommend setting aside a few hours to get everything in order — and here's our guide on how to start preparing your profile now.