The official reply
Is that the areas with limits are: Critique and SYS. Each of which can have 1 thread started per day. So, you can share 2 shots and you can get critique on 1 shot all in a day. And the critique thread rule applies to all areas (so if you start a thread in Landscape you can't go and start another one in Animal / Wildlife). Other than that, there are no posting limits in the other areas. Hope that's clear-ish