When creating a survey, each individual question has an option to apply a tag to anyone who answers that question.
This seems to indicate that only people who answer this particular question will have this tag applied to their profile, and anyone who skips the question or chooses not to answer it would not.
However, this is not the case, everyone who takes the survey, and therefore passes through this question, has the tag applied to them.
This seems to defeat the purpose of the feature as I could just as easily apply a single tag to everyone who takes the survey from within the page settings.
Thank you Hector - right now this is expected behavior - the work around is to tag individual answers rather than questions themselves. We will let you know if there are any changes to surveys please keep following this page (and any pages tagged 'suggestion - survey pages' below) for updates.