Twitter's Tweet With Your Location feature allows you to selectively add location information to your Tweets. This feature is off by default and you will need to opt-in to use it.
If you're wondering How to Tweet With Your Location, please check out the How-To help page. This article provides:
Once you've opted-in:
For example, here's a Tweet from @andrewhyde, letting us know about a conference in the Belltown neighborhood in Seattle:
Meanwhile, @colbay tweeted her exact point at the San Francisco Airport to let us know she's back from vacation:
Even once you turn Tweet with Your Location on, you have additional control over which Tweets (and what type of location information) is shared. The FAQ below has more information about how locations are displayed with your Tweets.
We want you to have control over how and when your location information is shared. With this in mind:
For example, this Tweet only shows a place (the Goose Island neighborhood in Chicago):
If you select your exact location to be displayed, the actual coordinate can be publicly shared.
In the Tweet below, you'll see a pin icon in the top right hand corner of the Tweet, indicating that it's geotagged. Location information is displayed at the bottom of the Tweet, along with an exact point marker in the map to the right of the Tweet: