Hashtags are transitive, don't "belong" to any person, organization, or concept. There's really no way to determine all possible hashtags that have ever been tweeted.
If you narrow your problem to the hashtags that you'd like to use, you could use the Search API (or a 3rd party social media analysis tool) to get an idea of how often the hashtag is used and in what contexts, but at least with the Search API, you'd be bound to about a week's worth of data. Taylor On Fri, Dec 10, 2010 at 9:30 AM, RF <rfrank...@airportview.net> wrote: > I have a hash tag issue. I am posting hourly weather reports to 3000 > accounts, one per automated weather station (AWOS). Each station has > a unique, 4-character ID, like KFNL. I use the station ID as a hash > tag so people who are interested in the weather at a particular spot > can find it quickly. > > The problem is that some of the station IDs appear to overlap with > hash tags that are already taken. I have already fielded and > addressed one complaint from the #KMLF knowledge community. What I > want to do is prevent these conflicts by removing the # from those > stations that are already active hash tags. > > So where can I find a list of existing hash tags? Doesn't seem to be > anything in the API specifically for identifying them. Thanks. > > Ray F > > -- > Twitter developer documentation and resources: http://dev.twitter.com/doc > API updates via Twitter: http://twitter.com/twitterapi > Issues/Enhancements Tracker: > http://code.google.com/p/twitter-api/issues/list > Change your membership to this group: > http://groups.google.com/group/twitter-development-talk > -- Twitter developer documentation and resources: http://dev.twitter.com/doc API updates via Twitter: http://twitter.com/twitterapi Issues/Enhancements Tracker: http://code.google.com/p/twitter-api/issues/list Change your membership to this group: http://groups.google.com/group/twitter-development-talk