First, your eyes are much, much better than mine. All the text on the site is, to me, either unbelievably small or has unbelievably bad contrast with the background.

As for the site itself, I think it's hard to say what it could become until it gets bigger. I'm not really sure why I'd want to use it right now. Finding people with all similar interests would be cool, but what would we share? It's not like there's content out there that's simultaneously about guitars, programming, go, and cooking. So why would I include all those tags instead of posting guitar stuff with guitars, programming stuff with programming, etc.

It also seems like searching/browsing will be strange. If I'm interested in the 4 things I listed above, I need to check 15 combinations of tags to make sure I'm not missing anything.