We have recently made adjustments to the main feed so that they better serve you content that matches your interests. As a result, your feed will no longer be chronological. Instead, you may see content from friends and following that could be a few days old. All the same, the feed updates frequently to ensure that you always see content you have not yet seen.
Please contact customer care if you see any posts that are older than one week, or if you have general feedback regarding the main feed changes. We would love to hear from you.