25. The method of claim 1 wherein publishing content items in the activity stream is further based on machine learning.
25. The method of claim 1 wherein publishing content items in the activity stream is further based on machine learning. 27. The method of claim 25 wherein the machine learning includes determining similarities based on previous actions by the other users and the ranking includes promoting the rank of a content item in proportion to a number of previous similar actions by the other users.