Dial2Do is a free (as in free refills) voice transcription service that interfaces with several other websites. During the registration process at Dial2Do, you'll enter in and verify your mobile phone number. This is how Dial2Do records your voice and recognizes that it's you who is calling. Then when you want to use their service, you'll contact Dial2Do via your mobile phone by calling their toll-free number. After placing the call Dial2Do will first ask which service you want to use. Some of the most basic and convenient services include sending text messages, email, and reminders.

I have found that every explanation of twitter is the same, so I'm not going to reinvent the wheel in this post, simply provide the information:

Twitter is a service for friends, family, and co–workers to communicate and stay connected through the exchange of quick, frequent answers to one simple question: What are you doing?