[riffraff]

would you really use a commenting system on your site in which people can only reply with 140 characters?

[adventured]

For comments, it would cut off the display on Twitter at 140 characters, with a link to view the full comment on the external site. This would also encourage site owners to adopt the system, as Twitter would push tons of traffic.

[alexanderpease]

I wouldn't necessarily want every comment I write to become a tweet. Like this one, for example