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It might be worth trying out to have random stuff show up on user feeds. Make the background a slightly different shade to distinguish it. One key is to be able to dismiss such stories from the stream. I can tolerate annoying stories if I am able to hide them.
That's my current thinking. If I could see them for what they are, and dial it up or down, then it might be a good approach. Feed feeling stale? Dial up the outside content component. Too much noise? Dial it down.