Founded in 2013 as a tiny side project, Product Hunt has become the place for makers and companies to launch their latest app, gadget, or physical products to the world. It's a global community of friendly folks sharing and discussing the latest in tech.
You can share your launch link however you wish. The only real rule here is that you cannot ask people directly to upvote your product. Instead, ask them to visit and comment. Check out the full Launch Guide for lots of promotion tips.