Member Rara Avis
There are no official rules against posting too many poems. What there is, instead, is common courtesy and respect for others. When someone posts "too many" poems, it obviously is going to push someone else right off the first page - and fewer people will read their work (sadly). Chances are also good, if someone has too many poems on that first page, their work will likely be read by fewer people, too (not so sadly).
If you are posting different work in multiple forums, that's no longer a problem.