If you donated 5 euros, you were allowed to invite 2 friends to the site.
If you were a member of the site for a certain amount of time with a certain ratio and amount uploaded/downloaded, you were able to invite 2 friends a month and had access to the same features as donators.
If you were a member of the site for a certain amount of time with a certain ratio and amount uploaded/downloaded, you were able to invite 2 friends a month and had access to the same features as donators.