Wikipedia - I did some snooping, and Greg's article has been deleted in 2013 and 2014. In case someone's interested,
HERE is the discussion in December 2014. Basically, 3 out of 4 people thought he's not notable enough for his own page. I don't think that's surprising, as he's just a DALS dancer in the public eye. Btw, Alizée's article has been edited over 3,000 times.
Forums - I completely agree with Lucas, message boards are a dying breed and have been for a long time. Why go to a forum, when you can follow tons of celebs on Twitter/Instagram etc, and get the info in between exchanging selfies with your friends.
Greg has over 100K followers on Instagram, and that's quite a lot IMO, when Alizée has 240K. I doubt Greg has many non-French followers.