If you’re interested, you can see some overview visitor statistics for couchsurfing.com on quantcast.
Why CouchSurfing is enabling QuantCast to measure visitors is an interesting question. No doubt this will spark lots of “theories”.
Personally, I think it’s interesting to note that the weekly reach of couchsurfing.com is circa 300k people, nothing like the 1m “members” that CS Inc claims (at best their are 1m profiles).
Callum, I’ve removed a l in the URL.