Josh Gans on Borders' death-by-internet

As Borders filed for bankruptcy - supposedly at the hands of online shopping and eBooks - economist Josh Gans had one thing to say tweet:

"Borders closing? Where will I go now to browse through books I then buy on my Kindle?" (@joshgans, 2011)

Sidenote: How long before Chicago Manual of Style has a section of referencing tweets?  Anyone seen anything along these lines yet?   - sezflom