In terms of the forums, unless somebody is blatantly making something up, pretty much anything basketball-related can be discussed. It's fan-driven content, so we don't say much about that.
In terms of the front page, we're a blog run by fans, as well. While CelticsBlog has gotten big enough and legit enough to get press credentials, etc., we still get the vast majority of our content from other sources. We have to make an editorial decision: do we wait for deals to be confirmed and only comment on "news", or do we run with the rumors that are out there.
We try to find a middle ground. We try to only take rumors from the media, and when we think a "rumor" is sketchy, we label it as so. We try to give people lots of things to discuss, if they're so inclined. However, they're only discussion points, and I don't think any of us are representing this stuff as a done deal.