The key legal words here are ENTANGLEMENT and ENTWINEMENT.

In other words, a private person or private company (such as a social media company) cannot violate your constitutional free speech rights, only the government can do so.

The entanglement exception applies when an action to restrict speech by a private party is such that the state has significantly involved, or entangled itself, with the private action. This occurs when the “power, property, and prestige” of the government is behind the private action, and where there is evidence of the overt, significant assistance of state officials.

The entwinement exception applies when an action of a private party can be treated as though the action were of the government itself (i.e., overlapping identities). These exceptions are rarely used in free speech cases and apply in very limited situations.

https://accessiblelaw.untdallas.edu/limits-free-speech-social-media

The key legal words here are ENTANGLEMENT and ENTWINEMENT.

In other words, a private person or private company (such as a social media company) cannot violate your constitutional free speech rights, only the government can do so.

The entanglement exception applies when an action to restrict speech by a private party is such that the state has significantly involved, or entangled itself, with the private action. This occurs when the “power, property, and prestige” of the government is behind the private action, and where there is evidence of the overt, significant assistance of state officials.

The entwinement exception applies when an action of a private party can be treated as though the action were of the government itself (i.e., overlapping identities). These exceptions are rarely used in free speech cases and apply in very limited situations.