From technofriends.in
To track your FedEx, UPS, DHL, USPS shipments using Twitter, follow the steps mentioned below.
1. Follow @trackthis
Since @trackthis uses direct messages, you must follow it so it can send direct messages to you. @trackthis will follow you back immediately so that you can send direct messages to it.
2. Send a Direct Message to @trackthis like: 123456789123 New PC
Just send a DM with the FedEx/UPS/USPS/DHL tracking code first, followed by a nickname for the package. Click here to send your message.
Example: 123456789123 Macbook Air
3. Sit Back and Wait!
You’ll receive a direct message each time your package changes location. You should receive the first message within twenty minutes.
Check out more at http://trackthis.pb30.com/
