Facebook allows you to group your friends into smaller lists and share photos and updates with these subsets of people. It is possible that you inadvertently changed the "audience" setting for your posts so that your photos are only visible to those on the Close Friends list.
Changing the audience setting by accident is not that difficult to do on Facebook's Web site. When you compose a new update, look at the label next to the Post button. If it says "Close Friends," your updates are only appearing in the news feeds of people on that particular list. Click the triangle to the right of the Close Friends label and choose Friends to make your updates visible to everyone on your friends list.
Facebook remembers the audience setting you last used and keeps posting items that way until you change it. If you want to adjust the audience setting after you have already shared a photo, link or update to your timeline, go to the post and click the small gray audience icon under your name. The audience drop-down menu appears so you can change who can see that specific update.
—nytimes.com
