I have to admit that this article shows the truth behind SU and my experience shows that the trust factors are higher on SU than Google and all others.
Google is built on social hubs and so does StumbleUpon with more insights of identity. You will get closely connected to new and older friends than on any other level.
Just like all new social music sites. You can SU Me and many old friends.
One problem is that SU could not identify how unique those SU users are, would any marketers be able to get 50 users name, sure yes.
StumbleUpon.com vs Digg.com popularity Analysis
Sutmbleupon.com
PR 7
age 2001
del.icio.us 4837
Yahoo Links 3 790 000
Yahoo .edu links 4 500
Yahoo .gov Links 740
ALEXA 410
dmoz 13
Cached pages 304 000Digg.com
PR 8
Age 1998
del.icio.us 17 325
Yahoo links 6 450 000
Yahoo .edu links 6820
Yahoo .gov links 15
ALEXA 78
dmoz 22
Cached pages 438 000
As from traffic conversion sides, SU is not bad at all and I would vote for SU vs Digg and myspace. Check SU vs Digg on Alexa.com and try to see Google Trends for those brands but one thing to remember StumbleUpon has a great toolbar.
