When your website becomes popular spamming attacks are constant because for the back links exchange into their website for free. Best solutions is to compare 3 famous plugins or modules to stop spamming this are 3 providers in the net mollom , defensio and akismet. Aksimet is popular plugin for wordpress while mollom is for king drupal platform. Defensio is for popular for facebook protect from spamming. Facebook has become worldwide popular but only few are given advices that defensio help your account from spamming and malicious content detection, profanity filtering.
Spamming are garbage words in your website but with the right plugins they are prevented or block.