With snarky commentary and a link to the source, there’s little room left for insight in 140 characters
Personally, I’ve used the comments on some of my posts (and those on other blogs) as inspiration for new posts here. I’ll add my comment on the original post, and then expand on it with a new or slightly different take. That opens the discussion up even further, both on the new post and the original. (Play fair—always link back to your inspiration.)
Though content may be the instigator, it’s the conversations among the community that often make the content. And maybe it’s just me, but Twitter seems to be taking more of the conversations and making them 140-character bites.