Frequent tweeters are upset if a friend's tweet publicizes something they did not want. [contrarian]
I found no correlation between how much someone cares about privacy and the amount of information they put online. For instance, Melissa Gira Grant reveals a great deal about her sex life, but is very protective of what she chooses not to share. Frequent tweeters are upset if a friend's tweet publicizes something they did not want disclosed. These findings are supported by other empirical studies showing that information disclosure does not imply a lack of concern for privacy. People employ strategies like withholding certain pieces of information, monitoring their friends' use of social media, adopting varying definitions of privacy, and editing their own lifestream in order to maintain a level of privacy they are comfortable with.
Alice E. Marwick, Status Update, loc. 640