I've been thinking about this all morning and the platform isn't the problem. After all, plenty of software is based on using someone else's platform to form legal agreements.
The problem here is the requirement of Consideration in contracts. Twitter can bind me to their TOU because they give me the ability to use their platform. Disney can't, because they can't stop me from using #MayThe4th on Twitter - there's no consideration from them to me, so there's no contract.
The problem here is the requirement of Consideration in contracts. Twitter can bind me to their TOU because they give me the ability to use their platform. Disney can't, because they can't stop me from using #MayThe4th on Twitter - there's no consideration from them to me, so there's no contract.
If you could trademark dates, however...