It goes without saying that not all friends read the same as you. It is also clear that if someone is added as a friend, then the opinion of this person is not indifferent.
And do not combine it together? Create such a method of attracting attention to interesting (in the opinion of your friends) topics.
Ie next to the button "in favorites" button "throw friends." ')
Well, after the details of the design. How to submit such a list of recommendations on the side of the recipient. To enter or not the possibility of comments for friends (so that they know what got your attention in the post - like “see the world conspiracy, afftaion burns”;). To send only to the first circle or to all, but with some kind of extinction. Introduce the ability to choose from whom to receive or even to rate (so that someone who comes in through 3 hands will fade out gradually). Do groups of friends for such recommendations (these are fun jokes, these are smart guys, these are places where you can flush.;) Or announce such groups among friends, and let them choose which ones to subscribe to (and with what default rating level, if he will receive messages from this group).
It will turn out to be an analogue of what is happening now in icq and mail, when everything new and cool is sent via personal mailing lists.