I think Ashley's first post is really the best way. Vigilance is a proven method.
What ever you do tho never click on a link if your not sure about it.
Even if its not harmful, it still gives the botter what they want ....page views.
And that will only encourage them.
When in doubt, copy the suspect post's text, and google it.
Chances are it's been pasted verbatim across hundreds of other forums.
Remember bots are only as smart as the guy that downloaded it from the guy that made it.