[mooxie]

Well the article notes that some amount of user demographic info is revealed simply by interacting with the post, regardless of the information provided by the respondent.

Secondly, this is almost like the email phishing paradox: to an educated user it seems like the number of people who respond with relevant information would be extremely low, but if the attempt costs you basically nothing and you get something useful 1% of the time, you're still winning.

"My perfect fall day is my memory of Aunt June when we lived in Connecticut in the 70s, before she passed away." In itself something like that doesn't seem useful, but there's a good amount of information in there if someone can correlate it with other details about your life.