For one week I didn't see any twitter update, so I didn't retweet anything, is the bounty finished or paused ?
It is not finished nor paused afaik, but it has been a little bit quiet lately, I agree. I think they are in deep preparations for the ICO and also preparing some kind of (additional) marketing campaign for that.
Is it possible to see blog bounty spreadsheet anywhere?
As already stated earlier, there is a blog bounty spreadsheet, but it is not publicly available (yet).
Is the signature bounty of your project available for newbies?
No, you have to be at least Junior Member to participate, see the first post of this thread.