Flippro, don't get irritated. I'm a friendly.
If you can get input, then you should try to run with it. The last thing you should do is take a combative attitude with potential users.
I think you should consider a more targeted approach (e.g. give people 5 possible stories to comment on, with accompanying pictures, and change them every week.) People do not like to have to consider too many options simultaneously. Make a contest for best comment on the five articles. To start, subsidize the entry fees heavily, but charge something so people get used to interacting with the site.
Here are some questions to consider...
What type of content does tweetforum aggregate?
What message about content does the tweetforum main page convey to users?
Are there better sources of this content?
How do tweetforum users interact with content?
How does this differ from interactions which could occur on another forum?
Who are the target users of tweetforum?
Where do these users hangout and how can you get their attention?
What advantages does going to tweetforum have over an alternative venue?
Ideally, answers to these questions should be short and obvious.