The Twilleetio by Trevor Smith is a tool for phoning in short audio segments and sharing them with Twitter, allowing users to leave messages that can be tweeted and shared. The tool uses the Twilio API to dial phone numbers and share audio files. Users can try out the application by dialing (206) 455-6221 using passcode 4422, leaving a message, and choosing to tweet it. The Twilleetio Twitter account provides a link to the audio file and a transcription of the call. Additionally, Twilio offers API reference documentation, SDKs, helper libraries, quickstarts, tutorials for various languages and platforms, as well as a resource center with ebooks, industry reports, webinars, and a developer community hub called Ahoy.