Anonymous organization/team, no differentiating USP's, no privacy policy, no terms of use, no idea how/if this will be monetized (are we the product?). Also no source code, no decentralized social networking. Imho you should definitely bring more clarity in some of these areas.
congrats on building and shipping something, and thank you for sharing it here. i like the minimalism of your landing and signup pages. however there are some significant concerns to address:
why would anyone want to use this? what value does it provide? what is the experience like for the people who receive a Slap?