This is an interesting idea to drum up use of Trip Advisor. This link is from the Flying Blue news site (that is in English) but the link to take part is all in Dutch. So, I would suggests you use a browser like Google Chrome that can translate the page over to English.
This promo seems very straight forward and is simple to sign up for. You use either your Google+ or Facebook profile to log in and then get to work reviewing places you have been on TripAdvisor.
The page say it is to be in Dutch but TripAdvisor brings up places near where I live and has points for just about everything. I tested one review and it seemed to award me points. Not sure how long it takes for them to dump over to my Flying Blue account or if they even will but I will test this for now.
If I can score even 12,500 points a year that is enough for me to get a LEVEL 1 award (one-way) per year flying on Delta metal for just using this site to add some reviews to TripAdvisor. That works for me! – René
Also – Need a FlyingBlue account? 3,000 bonus points for joining and flying possible HERE!