PackageTrack allows you to track your package via Twitter. Yes Twitter. All you have to do is:

1. Follow packagetrack on Twitter, within a few minutes packagetrack will begin following you.
2. Send a Direct Message packagetrack with the nickname and tracking code, separated by a “:”, eg. “Amazon Books: 23345631243″ of a package you would like to track.

PackageTrack currently only tracks UPS, USPS, and FedEx packages, and they will be adding more carriers shortly as well as going International soon.