Disney claims anyone using a Twitter hashtag is agreeing to their terms of use
At a rummage sale a few years ago, I bought a book published by Disney in the 1960s or 1970s which had instructions on how to make Mickey Mouse puppets.  It also said to "have fun" making them.  Selling things for a profit is a lot of fun.As far as I'm concerned, I now have a perpetual, transferable license to make and sell Mickey Mouse puppets.  I even asked a lawyer.