An investor asked us recently why we compute our viral rate in terms of registrations and not in terms of visits to Sampa.com.
In other words, we compute our viral rate based on the number of new sign ups to our system, not on the number of visits to our site.
We know of other companies that consider their viral rate how many people visited their site referred by another user.
Both methods are correct, it depends on which kind of website you have. For us, Sampa.com is not a destination site. Users go to www.sampa.com, sign up for the service and they are off editing their site on a different domain. So, tracking viral rate as the number of visits to Sampa.com makes very little sense.
On the other hand, a site like eBay, Google and MSNBC are destination sites. Traffic matters, visits matter, unique users matter.
For us, all that matters as well, but not on www.sampa.com.