I've been talking about them for awhile now :-) No one listens. :-( - Jesse Stay

I haven't noticed it at Twitter, but I've noticed favorites used that way on identi.ca - Spidra Webster

The fundamental flaw seems to be one stream per account. So the only correct way to seriously use Twitter is to make several topic-specific accounts. - Vezquex

Jesse I'm just glad to hear that I'm not too far off base. If you are talking about tagging someone will listen. Louis thanks for sharing. - Keith - @tsudo

Vezquex you hit the nail on the head. I think tagging may provide different data streams. Thank you for reading. - Keith - @tsudo

No one's talking about Twitter tags because there's only one tag used on Twitter AFAIK, which is the favorites tag. No doubt, as Twitter continue to try and make twitter 'stickier' they will add some though. - Jim Connolly

The lists can operate in a "tag-like" way, but as Vezquex mentioned, those who tweets about just 1 subject and 1 subject only are accounts that market or promote something (ie Dell & CoffeeCupNews), whereas most accounts are also/mainly used for personal tweets. - The Real sofarsoShawn

Here's where I touched on it: http://staynalive.com/article... - I've been mentioning this on Twitter and on the dev mailing list for awhile though. Twitter needs a meta layer so developers can categorize Tweets like you mention. - Jesse Stay

What about using hashtags like #SideWiki #WhuffiesWelcome, (add your favorites here) .. - Dr. Fridemar Pache

Fridemar - I think hashtags only suit their search function. I'd like to see a separate system for actually tagging a tweet based on subject. - Keith - @tsudo

The post has been updated to include references to Jesse's article and the ongoing conversations. - Keith - @tsudo

FWIW when I asked it on the Twitter list about a year ago Twitter said they were working on a meta layer to the API. I'm banking it will happen eventually. - Jesse Stay

I'd like to see an equivalent of flickr's machine tags for Twitter. - Bryce Roney