From site:

The centerpiece of the NMAAHC Museum on the Web are the collected reminiscences of ordinary Americans. These stories, called “memories” are collected as text, images, and audio uploads in the virtual Memory Book where website visitors are encouraged to submit their own histories, traditions, thoughts and ideas. Memories are then associated visually with other aspects of the museum’s holdings and scholarship, such as photographic portraits from the Let Your Motto Be Resistance traveling exhibit or the Save Our African American Treasures program. Memory Book contributions may also be associated with offerings from other visitors, enabling the creation of a dynamic social network for the NMAAHC community.