Having to have a facebook account is a real downer.
You don’t need one to solve the puzzles.
Not as much fun as this one: http://www.coinheist.com/rubik/a_regular_crossword/grid.pdf
When I first found the link that exact crossword was what it reminded me off, I remember them being handed out at a local perl user group, extremely fun. Haven’t managed to finish it yet though…
I’m not sure if this is your project or whether I’m shouting into the wind but the UserReport pop-up modal appeared on my first visit asking if I wanted to fill out a survey for prizes. It’s a tad-in-your-face and I’m not sure I really see a need for the obstruction.
Edit: Having said that I can’t get it to do it again after clearing cookies.
Edit: replied to wrong comment, sorry.