If you see tinned meat...
Generally, if you see spam, either in the forums or as actual instructables, the best thing to do is to hit the flag button and move on. If you leave a comment, the systems that quarantine spam get slowed down, and the spam remains visible for longer than we would like.
If the spammers go beyond annoying, and actually become offensive, you should still not comment, even on their Orange Board. Instead, contact HQ via email at email@example.com, or PM a member of the Community Team, who can speed things up.
Instructables is a special place, and it's you folk, reading this, that help keep it that way.