Where they find them? While I reported 2 cases of "white " Nigerian girls, which my experience tells me they are definitely scammers I got the following message from interpals board.
Your account has been flagged for abusing the "Report to Moderator" system with excessive, frivolous or unfounded reports.
This is a violation of the Terms of Service. Please note that this is a warning and any further misconduct could result in the deletion of your account.
So if my assumption is unfounded you tell the first rogue user created it's account minutes before while the second had it for 11 hours.
That takes me to the assumption that interpals favors or it's part of the scam. Hence the variety of pictures scammers possess.
Take a hike from here.