How about forming a committee to rate the posts with symbols inserted into the heading, like:
M -- mature
X -- pornographic
WOT -- waste of time
U -- unintelligible
U -- useful
U -- useless
S -- sickening
Su -- subversive
F -- frivolous
H -- humorous
R -- redundant
L -- libelous
F -- false
P -- plagiarism
PIC -- politically incorrect
T -- tasteless
T -- too many big words
T -- too liberal
TL -- too long
etc., etc.
<g>

Robert