Recently, trying to log in to Endomondo with my Facebook ID, I saw error message along the lines: "Could not log you in. Some software (like AdBlock) can interfere with login". (This is not exact message, I did not make a copy).
I know, that some websites detect AdBlock or similar tools and then try to convince user to turn it off for their site, either by "guilt tripping" the user or even by disabling some functionality and content.
Can tools like AdBlock really interfere with Facebook login? Or is it some "clever" way from a website to convince me to turn AdBlock off?