1. Facebook introduced timeline profiles for pages in February 2012, which became mandatory for all pages by March 31, 2012. The new format removed default landing pages and increased custom page widths.
2. Key elements of timelines included a large cover image, profile picture, about section, app display, pinned posts, milestones, and activity feed for user engagement. Proper use of these elements was important for representing brands and driving user interaction.
3. Admin controls like the activity log and settings panel provided insight and customization options to manage the page experience within the new timeline format. Pages had to adapt to the changes or risk falling behind competitors on the platform.