[webwright]

I think it's less popular than these stats might indicate.

1 Facebook user might click on 1 or 2 links per day.

1 SU user "stumbles" dozens or hundreds of times in a session.

A stumble nets a pageview, but obviously has considerably less value (no intent baked into the click).

[sudont]

Quote from a friend who stumbles: "oh yeah. totally. i hit 100 pages and maybe read 5 of them"

It's like a youtube party, but with a little fast-forward button: http://xkcd.com/920/