"I guess I'm not sure if/how FB tracks that type of metric. I suppose they could surface pageviews or clicks/impressions for items you share, but based on the gen pop of FB, would they invest in a feature that isn't very germane to their base users? Somehow I doubt the average FB user cares about engagement as a metric. Probably just wants that old college buddy to see the funny drunk girl picture. I also think engagement doesn't apply well to FB b/c the network is closed by design, whereas Twitter and blogs have open networks. Tough to measure network vs. network." - Jake Kuramoto