In “The Social Network,” Facebook founder Mark Zuckerberg is dressed down by his ex-girlfriend for his misogynistic comments about her on his blog.

“The internet isn’t written in pencil, Mark,” she says. “It’s written in ink.”

It’s an important idea – one that sometimes gets lost as we immerse ourselves in Facebook and Twitter and political blogs and all the rest of the digital footprints we leave around the web on a regular basis.