The article has lots of words and stupid pictures so here is a summary:  if you give someone your number (via any app or medium) and they have the FB app installed, it will recognize it as the number of a user and trigger the friend suggestion.<p>The best way to handle the advent of this information is to treat your public facebook profile as public information and assume even the creepiest stalkeriest guy on the internet has access to it.  Cause they do.