The court affirmed a lower-court ruling that B&N's terms of service were not enforceable against Nguyen. As a result, the arbitration agreement in the TOS didn't apply, and so B&N must now defend a class-action lawsuit.

The court's reasoning isn't a model of clarity in some respects, but the main takeaways seem to be these (consult your lawyer, don't rely on this as legal advice about your specific situation, etc.):

1. In a browse-wrap agreement, apparently it's not enough to include just a link to the terms of service. The link should explicitly --- and, preferably, conspicuously --- warn the user that use of the Web page will constitute assent to a binding contract.

2. It's best to put the link and its warning in close proximity to a button (or link) that the user must click to take action, e.g., create an account, place an order, etc.

[1] http://cdn.ca9.uscourts.gov/datastore/opinions/2014/08/18/12-56628.pdf