Save feature is an important feature and affects users and marketers. This user will ease the user's work, and they do not have to take a screenshot or copy the link to see later. Metrics to measure the save feature success;  Feature discoverability, percentage of users who have at least once saved an item > user knows about the feature.  The time frame it took users to save an item to open it again.  #of times the user opens the Save page vs. the #of times the user visits FB (% in 1 month)  Amount of time user spends looking saving page  Engagement; no. of likes, save, comments, clicking links, playing videos.  Percentage of saved items user is deleting after engage  User segmentation is based on FB usage and demographics.  What items are most saved, like images, text, video  Monetization