We also reserve the right to modify these Terms of Service from time to time without notice. You are responsible for regularly reviewing these Terms of Service so that you will be apprised of any changes.
(Emphasis mine.) Notice that they do not say that they will notify you when the Terms of Service change. It is your responsibilty to check the Terms of Service. So tomorrow, they could quietly amend their Terms of Service to read, “By agreeing to these Terms of Service, you also agree to pay orkut.com a fee of $50 per day in perpetuity, and you grant that orkut.com or its agents are authorized to use physical force or threats of force to compel such payment,” and it is your responsibility to notice this. And even if you do manage to notice this, their termination clause says
Once your membership terminates, you will have no right to use the orkut.com service. Our proprietary rights, disclaimer of warranties, indemnities, limitations of liability and miscellaneous provisions shall survive any termination of your membership.