As found on Wikipedia:
Certain websites are noted for having carefully designed terms of service, particularly eBay and PayPal, which need to maintain a high level of community trust because of transactions involving money. Terms of service can cover a range of issues, including acceptable user behavior online, a company's marketing policies, and copyright notices. Some organizations, such as Yahoo!, can change their terms of service without notice to the user base."
UW has the direct links for HubPages use for you, I suggest every hubber read through them!