13. The computer program product of claim 12 , wherein generating the additional content items comprises weighting the additional content items based on user interactions between the first candidate user and the other users.
12. The computer program product of claim 8 , wherein the computer readable program when executed on the computer also causes the computer to receive content items from a stream of content of other users with whom the first candidate user has a relationship and generate additional content items for the stream of content of the first candidate user based on the received content items.