I don't know how much longer I will be here before banishment, but I too have had posts and threads deleted. In all my web dealings a thread is locked and you can see the reason for why. Maybe they don't want to scare everyone off in posting by leaving the reasons or the threads, but they should so everyone can see what was wrong. It can also be a reminder.
I posted my artwork this morning. Never use a website....yours or anyone else's. I guess it is alright to post a link to a blog, but be careful, that might be wrong too. Some folks either get overlooked or some of us newbies might be under the microscope. Not sure. But, many of us want to learn. And we can't get there if we are consistently being hounded.
Soon you drive off those that give the most contribution to the site. JMHO