Where can I promote/beta test my new site?

Hello,

I am wondering where I can post my simple new website - It's a simple social media site that gets discussions going. I know some subreddits don't allow promotion. I don't really want to post it here, but more for a general audience to try it out and help me grow the user base and serve as a soft launch for the site. And hopefully the user feedback will help me improve it for a full launch or debut. Thanks for any feedback.