Yesterday when I was scraping all a just resealed hindi movie song ; got to know that there is no word verification orkut.com/blahblah.... and http://......etcetc.blogspot.com/ in orkut (to friends only). So what is the advantage?
[CAPTCHA] for sending links like http://www.
You can invite all your friends to your community on a go or you may ping your blog updates via scrap.

update: Also no captcha for
=> picasa [google photo hosting service like flickr.com] links
=> slide.com, rockyou.com flash files
=> youtube and google video links / embedded HTML scripts
as well as orkut.com links but blog*spot site links need captcha.