Why not use the tweet's ID? That would preserve the conversation/context as well. Also, I've seen the word "tweet" used to describe posts on Seiba Weibo. It's

Why not use the tweet's ID? That would preserve the conversation/context as well. Also, I've seen the word "tweet" used to describe posts on Seiba Weibo. It's possible that the term will be become ubiquitous to describe micro-blog posts. EDIT: Reason for not using ID: no one knows if they're permanent.