It's not as much of a critical mass (you don't need thousands of users or something), it's more a history of good behavior. If a few dozen read actions are posted to user's Activity Logs/Timeline and they aren't deleted often (or especially not marked as spam), that increases the weight to those and future actions. So, the more relevant postings made, the higher quality overall your app looks in the eyes of Facebook.I assume when the site reaches critical mass data will probably be weighted better and have a higher probability of showing up
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