I looked into this before and from what I understand, you cannot simply include "we change whenever we want" into your TOS. It is fine for small adjustments to

I looked into this before and from what I understand, you cannot simply include "we change whenever we want" into your TOS. It is fine for small adjustments to the agreement, but when you release something that significantly impacts you users, you actually must re-send a notification of change and get your users to agree to the new terms. At least, these actions are most likely to stand in court. Just my research though, perhaps a lawyer could comment?