Credit: Harry Campbell

A few weeks ago, a friend wrote to me with a problem. He said his daughter's name--let's call her Alice Haynes--was mistakenly appearing on the Internet as a member of a bowling group on the social-networking site Meetup. Because I'm on Meetup's board, he asked me to get her name removed. I checked on it; as far as I could tell, the Alice Haynes in question was not his daughter, but some other Alice Haynes in another city.

Select from the choices above to read the entire article.