A lot of it depends on the site and such. Some places allow a lot and some places don't. I think it's best to be on the safe side at first and then you'll know what you can and can't do. Sometimes I've noticed that new posters on certain sites get banned or punished in a frequent manner than long-term users if certain material is questionable. New posters that start things (or purpose or not) are quite a target because of the risk of the well-being of the site.