Looks really interesting and exciting.

Feedback:

- Strange decision to have several vertical feeds - doesn't seem very convenient. Can there be one stream with several tabs or something like that?

- It would be cool if there would be reddit-like discovery system, so that you could browse tags, and then sort the posts in the tag by hot/new/top.

Questions:

- What are your plans for this platform? Is it just a fun side project? Are you planning to compete with twitter?

- Are you planning to monetize?