The invention I mean is that when user X likes a post of user Y, the liked post of Y is included into the feeds of users who follow user X. I don't remember thi

The invention I mean is that when user X likes a post of user Y, the liked post of Y is included into the feeds of users who follow user X. I don't remember this mechanic prior to Friendfeed and then FB. Maybe I'm just unaware of prior art.