Hi everyone, this seems to be a constant problem for people trying to play on Facebook. Luckily there's an easy solution.
Follow this link and launch the game from the Play Now button.
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Unfortunately, even when this solution was tried, I still get the following message:
"The webpage at https://fb.deadzoneg...&fb_appcenter=1 might be temporarily down or it may have moved permanently to a new web address."
Just thought you should know...
I would recommend the second one (security exception), but that's up to you.