You can! To see an all-time list of announcements posted in your organization...
- Visit your organization page by clicking the dropdown at the top of your left-hand navigation menu and selecting your organization name from the dropdown menu.
- At the top left-hand corner of your feed, click the dropdown arrow next to All Posts
- Select All Announcements from the dropdown menu. This will display a full list of all announcement posts that have been shared in your organization.