Paul Clarke speculates here about the usefulness of Twitter, with a specific focus on whether its penetration can be used to local effect: in reporting weather conditions or traffic disruption, for example.
#uktraffic [road] [where: jcts or place] [direction] [description] RT&seewhathappens
By submitting hashtags in that form, it enables them to be parsed for use in other applications, allowing them to be mapped, summarised etc.
With all due respect, I don’t think the Twitter community is sufficiently diligent to obey what seem like simple instructions such as this. Yes, they can probably remember the hashtag. But I’m sceptical as to whether they can remember the specific items that follow, let alone the order in which they need to appear.
For syntax-dependent hashtags like this to work, there needs to be a mechanism by which they can be registered, complete with the required syntax. That way, end users can subscribe to such hashtags, allowing their client applications to prompt them with the required syntax once they’ve entered that hashtag. Much in the way that Excel prompts you with the arguments needed for a formula that you’ve started to use. (Hell, even I never remember the order in which SUMIF arguments should be entered.)
Without this, the hashtags might be used, but the data they generate will be next-to-useless.