text: Blocky (@blocky_bot, http://blocky.elliottkember.com) is a crowdsourcing
  solution for Twitter spam. Blocky does not define what a "spammer" is,
  so let's discuss.
  What makes you a Twitter spammer?
  - You follow me just to make me follow you.
  There's a good chance this applies when you start following me even though
  you already are following 500+ people.
  - You repeatedly tweet links to your own website(s)/service(s)/... whilst
  rarely tweeting anything personal.
  Of course a sane ratio will be highly subjective. To me maybe tweeting your
  ads more often than 1% makes you a spammer.
  - You're on Twitter for the sole reason that someone told you there's "social
  This definitely applies to anyone who "outsources" tweeting to someone
  else/a service (looking at politicians). It probably also applies to SEO
  people and other folks wanting to artificially raise attention or traffic.