title: spam detecting in website
body: <p>i m thinking of making a website..and i want to keep a track on the sent messages!
  what if some human and not a computer is sending messages that are nt at all subject related..any way to stop that! [apart from the public cooperation]</p>
  
  <p>as in how does stackoverflow keeps track of spams..
  how it makes sure that the message sent is totally to the point and subject related!</p>