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https://www.facebook.com/connect/ping?ancestor_origins=file%3A%2F%2F&client_id=&domain=embed.gog.com&origin=1&redirect_uri=https%3A%2F%2Fstaticxx.facebook.com%2Fconnect%2Fxd_arbiter.php%3Fversion%3D44%23cb%3Df1a507021a1414%26domain%3Dembed.gog.com%26origin%3Dhttps%253A%252F%252Fembed.gog.com%252Ff1d327ded8687d%26relation%3Dparent&response_type=token%2Csigned_request&sdk=joey

every time I go to the forum from the GOG launcher.
A bug, just take a look at general discussions, there are several threads about it and hopefully it will be fixed soon. It already happened several times :(