When you publish a dangerous pamflet calling for the destruction of the state, you only need to think of hiding your own identity when writing, printing and distributing the pamflet. Those who read it are only in danger if they hold the material in their possession for a longer period of time.
But when you publish a dangerous social media post calling for the destruction of the state, everyone who reads, likes, shares and reblogs it can be easily identified. Your post forms a beacon revealing a network of people interested in reading about the destruction of the state.
You may think you were safe hiding your own identity, but what about everyone who reads your post, including a lot of people who do not yet know how likely they are to be targets of state surveillance, how safe are they? Whether you like it or not, your post is an informer for the state.