[dredmorbius]

"Unpopular opinions" can change. There was a time when sexist, racist, and homophobic ribbing were de rigeur in society, entertainment, and business. They still are in some political circles. You might have friends, neighbors, or associates who turn out to be murderers, inside traders, political rebels, questioned for terrorism, whistleblowers, accused of partner battering, or of immigration irregularities (all drawn from my direct personal experience). It wasn't so long ago that a prominent political figure was accused of "palling around with terrorists".

Moreover, with profiling tactics, implicit signals can be leaked of your preferences and habits (isn't that precisely what all the heavy marketing support of all these "social" sites is about?). Subject of a current HN item:

https://news.ycombinator.com/item?id=6871033

http://www.nytimes.com/2013/12/08/opinion/sunday/shameful-pr...