Ideally, something like annotations (if/when it launches) could provide the necessary metadata for further filters. Agree that a small subset of Twitter users a

Ideally, something like annotations (if/when it launches) could provide the necessary metadata for further filters. Agree that a small subset of Twitter users actually have a need for something like this. In the meantime, check out an interesting startup that helps you curate time-boxed tweets: http://curated.by http://curated.by