Memori.ru and $ 100

I received a letter from memori.ru with the following content:

Hello Cyxapeff. This is Memori.ru with short and curious information.

From today on the website the action "Invite friends
to Memori - get $ 100" starts . Each
registered user of Memori.ru can participate in the promotion . The conditions are simple - you
invite your friends to register at Memori and the more friends you
invite, the better your chances of getting a prize.

The campaign will be held from May 18 to June 18, 2007. The

first 10 participants, at whose invitation the most
friends are registered , will receive $ 100
each, the second 10 participants will receive $ 50 each, and the third 10 participants will receive $ 25 each. Thus, the
first thirty active users will receive cash prizes.

The essence of the action is simple - tell Memori about your friends and acquaintances, explain to
them what is the beauty and convenience of social bookmarking. No doubt they
will also enjoy using our service.

For the terms of the promotion and real-time statistics, see the
contest page - memori.ru/konkurs

Participate in the promotion! Invite your friends to Memori and get a prize!

A rather unusual way to attract visitors to web 2.0 resources. We recently discussed that soon web services will be forced to pay visitors due to high competition. This is the first proof. Do you think this step will be effective?