The submission/banning criteria is actionable startup advice for tech startup founders. Relevant tech is OK as long as it directly relates to or is obviously useful to startups. No news. And no politics, economics, science, etc. unless it meets the startup criteria.
The site is running open source reddit, so there is ample opportunity to hack it as well. I've done a few minor things, and I plan to add email notifications as well. Feel free to fork reddit on github and play around.