I feel I am building a new Google Wave

For starters I wouldn't log in to a site like this using neither a Facebook account (which I have but it's full of bogus data) or a Google+ account (which I only have because they created it for me, which is when I deleted the little true info about me there).

Who cares how amazingly, mind-blowingly awesome your buddy the founder of Rizzoma is? This thread is about another project, and it's not based on Wave. This is hardly the place where you should walz in and shill for something else without so much as a word about Pivory, let alone some constructive criticism of any kind.

Here's some suggestions, keep in mind these are essentially my personal opinions:

-Try putting some thought into making the functionality a little more intuitive, by this I mean to try and not necessitate having to hover too much to discover functionality. As a designer I know how difficult this is to do without spoiling aesthetics, so good luck (but I think you need to do this).

-Host this as a SaaS and make money, I image businesses would love to use this as a way to gather user feedback and talk to users.

-Categories would be nice. Right now it's just one "board" (in the traditional "online forum" sense where the set hierarchy is forum>board>thread>post). I'd find it cool if I could say visit a "sports" category, or a "Tech" category, and especially a "Hacker news" one. Think subreddits.

-The "navigation" is a little unintuitive, on the left column where it says "Threads", "Lists", "Users". When in threads mode, the other modes are listed underneath it, suggesting that they form a child relationship to Threads, whereas they're really siblings.

-I'd dispense with the little arrows under "Home" on the left column, and move the refresh button onto the same line as the Create and Home links/buttons. It doesn't really add anything. Up and down could be implemented using infinite scrolling and would be more intuitive. Left and right could be replaced by making aggregating all the different views ("My threads", "Users", "Replies", etc.) into a flyout or dropdown list, accessible by hovering the currently active mode title. This would also mean you could dispense with the 3 bottons on the bottom left next to the settings button.

-Speaking of that settings button, it doesn't have much to do with searching, instead I'd move it closer to the "user button", which you don't really have but will definitely need. Opening the user pane on the right, and then clicking the username to reveal "log out", etc. isn't easy to find.

-You probably don't need all the corner hovers, they don't really do anything useful IMHO.

-Fluid layout so it works well on mobile devices

-The reading mode is cool but you probably don't need it everywhere.

Good luck, I love the idea. Hope this goes somewhere.