Static URL for profile images based on screen_name:
https://api.twitter.com/1/users/profile_image/abraham
* This performs a http redirect to the actual profile image URL. Currently https redirects to http. You can also add "?size={mini | bigger | normal}" to get specific sizes.
Redirect to profile based on user_id:
https://twitter.com/account/redirect_by_id?id=9436992
In_reply_to_status_id mentions:
https://api.twitter.com/1/statuses/update.json?status=reply+to+@abraham&in_reply_to_status_id=12410413197
* In the web interface new mentions are only replies if they start with @screen_name. By pushing @screen_name further along in the string your followers who do not follow @screen_name will still see the status.
Profile image sizes:
http://a3.twimg.com/profile_images/54160223/chart-black-small.png
* By default you get the original image size you can add _mini, _normal, and _bigger just before the image extension to change the size returned.
Block account link:
https://twitter.com/blocks/confirm/twitterapi
Follow account link:
*This URL stopped working sometime in 2009.
Logged out profile view:
https://twitter.com/loggedout/profile/abraham
Whitelisted IP:
Whitelisted IPs provide 20,000 GET request per authenticated user per hour, not a cumulative limit of 20,000 GET requests per hour.
SMS commands work through the API:
http://help.twitter.com/forums/59008/entries/14020-the-official-twitter-text-commands
Link to Twitter pages using the @screen_name syntax:
https://twitter.com/abraham/status/12413206301
View geotagged statuses on Google Maps:
http://maps.google.com/maps?q=http://api.twitter.com/1/twitter/lists/team/statuses.atom
Consistant @screen_name, #hashtag, and @screen_name/list linking and extraction:
http://github.com/mzsanford/twitter-text-rb
*Currently there are Ruby, Java, and PHP libraries.
Consistant character counting for statuses:
http://apiwiki.twitter.com/Counting-Characters
Twitter string translations:
http://apiwiki.twitter.com/Twitter-String-Translations
Security@twitter.com's PGP key
http://apiwiki.twitter.com/SecurityPublicKey
Map of a Twitter status object:
http://mehack.com/map-of-a-twitter-status-object
Search by app sources with spaces:
http://search.twitter.com/search?q=the+source%3Atwitterforandroid
Mobile friendly page to enable Geo:
https://twitter.com/account/geo
Check if your current visitor is authenticated with Twitter:
https://twitter.com/sessions/present