I understand that Nasza Klasa is a relatively recent phenomenon in Poland, where as we had FR in the UK years ago (and I'm kicking myself for not thinking about ripping off their idea and doing it myself in Poland ages ago).
I, too, looked into the possibilities of setting up - 4 years ago. I contacted 2 IT people, talked over the idea but pulled out due to my fear of a new, big boy appearing on the scene.
I think these two went ahead with my idea and will now be in the process of being wiped out due to a lack of capital to push their baby.
You can add me to the list as well. I abandoned the idea pretty early as several Polish friends of mine said it wouldn't work in Poland as most Poles tend to keep in touch with school friends. The ones they don't want to keep in touch with they don't bother with.
Needless to say I don't ask for their advice anymore :)
Nasza Klasa and Friends Reunited has a limited shelflife as once the majority of class mates sign up then there is no further incentive to renew subscriptions year after year. The creators will still make stacks of money though !!
I'm not so sure Nasza Klasa will be wiped out. Any company first onto the market always has an enormous advantage over it's rivals and in this particular case, once the rivals have rolled out their own version then Nasza Klasa will have swept up most of the market.
There are loads of business models in the UK & the US that could be transplanted in Poland. I 've dozens of ideas............just not enough money :(