The topic of whether Fritzing diagrams are acceptable/liked/allowed has been discussed (What do we think of Fritzing?) as has a request for more information about posting normal schematics (FAQ about posting schematics).
When a user posts a Fritzing diagram, is it possible to detect this and show some information about what a schematic diagram is versus a Fritzing diagram? This would not prohibit Fritzing links of course, but just provide a cautionary notification.
Failing that, I think a visual comparison of the two would be a good addition to the FAQ, so that we can point new or inexperienced users to it.
I agree with Olin and Clabacchio in the first question I linked, in that a Fritzing is better than nothing (it at least shows that the user is trying to share pertinent technical information). However, I find that comments on questions with such diagrams are often not overly helpful for the OP. For example: https://electronics.stackexchange.com/q/103604/2028