Alexa ranking for Posterous this morning and found the following information:
I was just checking the Traffic ranking globally: 506
Traffic ranking US 453
Traffic ranking UK 349
Compared to the general Internet population, the site appeals to people who have graduate education, browse from work and have no children. Additionally, age groups 25-34 and 35-44 are over-represented on Posterous and over 65's are greatly under-represented.
Ron Passfield
Brisbane Australia