Some of those customers have been suing Zappos, an online shoes and clothing retailer that's owned by Amazon.com. Zappos wants the matter to go into arbitration, citing its terms of service. The problem: A federal court just ruled that agreement completely invalid.
So Zappos will have to go to court—or more likely settle to avoid those legal costs.
Here's how Zappos screwed up, according to Eric Goldman, a law professor and director of Santa Clara University's High Tech Law Institute: It put a link to its terms of service on its website, but didn't force customers to click through to it.