What do you think about this startup?

If you're serious about this, I think you're going to need something a bit more compelling to offer. Another web forum is unfortunately not very interesting - and I'm saying this as someone who happens to believe the web needs more general purpose forums to compete against social media. It's like creating a new email client, it's going to take a lot to even get noticed. If the point of a startup is competition and disruption, well, you're competing against all of social media and the "anti social-media" imageboards, and I don't see where the disruption is.

It's difficult to tell who you're trying to appeal to with this. Your front page has clip art featuring nothing but upper middle class white socialites, as if you want to present this as a hip SV style startup, yet you're also clearly trying to imitate 4chan/8chan in a number of ways (calling yourself 'schan', naming your paranormal board /x, etc) suggesting an appeal to the lowest common (and not necessarily worksafe) denominator. Who is this site for anyway?

You have some badly scaled artwork, and none of the links in the footer appear to work because of multiple js errors. All of this suggests that you posted this site before it could even be considered finished. When I try to delete an arbitrary post I get a JSON parse error, which suggests to me you might have an unhandled exception being echoed somewhere.

I'm not saying it's a bad idea, but I think perhaps you should perhaps come back with something a bit more focused and complete if you're going to call it a startup. Or just open source the code and let people play with it. Or don't call it a startup.

Try to do something unique next time.