What are the rules, laws, and etiquette for advertising someone else's website(s)?
For example, if making up an anti-borg flyer, is it legal and/or appropriate to put something like: "for more information see jwfacts.com or freeminds" or whatever (I'm just using those as examples, since they came to mind)? I guess it would probably need a disclaimer saying that the creators of the flyer are in no way affiliated with those sites.
Or what about just a plain white business card with one website address on one side and another website address on the other (no other words or decoration)?
So what are the rules, written and unwritten, about such things?