50% increase in Colnect's growth rate - welcoming stamps and coins collectors

Less than 2 weeks following the initial release of Colnect V2 and without any commercial advertising of Colnect, there are already ~90 active coins collectors from 35 countries and ~50 active stamps collectors from 25 countries on Colnect. Active refers to a collector who has updated his/her personal collection on Colnect.

The overall amount of newly registered members during the last week shows ~50% increase over the weeks before it. This achievement, enhanced by the facts that the new site experienced some downtime and that registration now requires email address confirmation, should probably be attributed to the collectors who already know Colnect. Some collectors collect more than a single collectible and so many phonecard+coin collectors would know other coin collectors and let them know about how useful Colnect would be for them.

To help motivating collectors the following news item has recently been published on Colnect:

Help Colnect and Win Free Phonecards!

Colnect now has a huge stamps and coins catalog. However, since it's so new, many collectors of stamps and coins have not yet heard about us. Now is your chance to help Colnect and win free phonecards.
How?

Simply tell your collector friends to join Colnect. Once they join and update their collection, they should Contact Us and tell us you told them about Colnect. Every friend that joined Colnect with your help entitles you to 10 points. Each friend your friend bring, gives you 3 more points.
Who will win?

The 3 collectors who has accumulated most points until the 30th of November.
What will you win?

First place: 50 Phonecards
Second place: 40 Phonecards
Third place: 30 Phonecards
BONUS: A Colnect T-Shirt.
Questions?

Visit the forum for answers.

What about commercial advertising

Though so far Colnect did not rely on any commercial advertising but rather 'word of mouth' and friendly reviews and backlinks, it may be a good idea to advertise it some more with AdSense or a similar program. For the time being, I prefer to see a steady growth while I'm fine tuning the system and perfecting it rather than a flood which will make Colnect buzzing and later endangered.