Nitpicks:

Some phrases end with a period and some don't:

Spend less time to find information

Archive and return back later.

The post title (blue-ish) on the right side is eating too much space for no good reason. And it seems that the keywords are misaligned.

When listing the stories on the left, it might be helpful to also list the first sentence from the story and make the title bold. Here's an example from Mail.app http://bit.ly/MoQuiZ

It would be great if you can allow users to try the product without signing in. A readonly demo user would suffice.

Good luck!