Use Twitter Oauth Echo
X-Verify-Credentials-Authorization (Required)
Header Example:
OAuth realm="http://api.twitter.com/",
oauth_consumer_key="abcdefghijklmnopqrst",
oauth_signature_method="HMAC-SHA1",
oauth_token="123456-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOP",
oauth_timestamp="1234567890",
oauth_nonce="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNO",
oauth_version="1.0",
oauth_signature="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNO"
Header: X-Auth-Service-Provider (Required)
X-Auth-Service-Provider
https://api.twitter.com/1/account/verify_credentials.json

Fields to post in:
(post data should be formatted as multipart/form-data)
- media (required) - Binary image data
- message (optionnal) < 255 carac
- source (optionnal)
- url source (optionnal)

Sample response:
<?xml version="1.0" encoding="UTF-8"?>
<rsp stat="ok">
<mediaid>{photo_slug}</mediaid>
<mediaurl>http://rgb.li/{photo_slug}</mediaurl>
</rsp>