Especially HTC devices used to store part of the context information like this:
<HTCData><Twitter>id:11111111/friendof:00000000</Twitter></HTCData>
[WayBack] TweeterID – Twitter ID and username converter:
Convert any Twitter account’s username or @handle into its respective Twitter ID, or convert ID to username
You can also do the Twitter ID to @handle conversion by URL (at the time of writing, neither existed, which is intentional: replace your own ID there) [WayBack] permalinks – URL link to Twitter user with ID, not name – Stack Overflow:
I could not find a twitter URL that does the conversion the other way around.
–jeroen
The Wiert Corner - irregular stream of stuff 