Tweeting While Incarcerated (TWI): Oscar-winning screenwriter/director Roger Avary (Pulp Fiction, Beowulf)

Oscar-winning writer/director Roger Avary (Pulp Fiction, Beowulf) is serving a year in prison for vehicular manslaughter and DWI. Apparently, he's tweeting from prison: @avary. I'm not sure how one tweets while incarcerated (TWI?) in the US, since internet access is not generally afforded to prisoners. Perhaps he's permitted a cellphone with a texting plan. Update: All is explained in the comments. (via Shane Nickerson)