Efficacy of Internet User Agreements: Can they stand up in court?

The internet is unlike physical products, which often come with a warranty, manual, and return policy. Internet products, on the other hand, present a unique set of challenges when it comes to user agreements and whether they have legal implications. For instance, if a website promises certain benefits to its users, but later changes its terms and conditions, can the user still claim the abandoned benefits? Moreover, even if the user captures a screenshot or web archive of the changes, it is unclear whether this proof can hold up in court. This raises the question of whether internet user agreements require third-party certifications or public notarization to be considered binding.