Ok, wrong place, but, just to share the experience.
1) I cannot push the feedback button fast enough. Every time I scroll down the page for feedback button, it just loads more stuff and the button is out of the view again. After chasing the button for a bit, I have to give up. Fun for April Fool, but, it is kinda too early.
2) A bit confusing to make wall post on a search bar.
3) The globe has no tooltip, so, it is hard to know what it is for. I accidentally figure out it sets the default setting of your search/post.
The site is smooth and all, but, it doesn't support apps yet, which is not as interesting as FB. Hopefully they set a very long commitment and catch up to FB, because it is going to be a long struggle with very little cash flow.