Whether it is unlawful to censor a social media account depends entirely on who is doing the censoring. [1]

Private Individuals & Platforms

• Private Citizens: Private individuals can censor or block other accounts. The First Amendment only protects you against government suppression. [1]
• Social Media Platforms: Private tech companies (like X, Facebook, or Instagram) are not legally bound by the First Amendment. There is a widely accepted online consensus that these platforms can legally delete posts, suspend users, or curate content that violates their Terms of Service. [1, 2, 3]

Government Officials & Public Entities

• Public Officials (Official Accounts): Elected officials and government agencies acting in their official capacity cannot censor users, block accounts, or delete comments based on viewpoint. The U.S. Supreme Court ruled that when a government official uses an account to conduct official state business and speak for the state, they establish a public forum where viewpoint discrimination is unconstitutional.[1, 2, 3]
• Public Officials (Personal Accounts): A government official can block users if the account is strictly personal and they are not using it to perform their official public duties. [1, 2]

For more specific guidance on your rights, you can review resources from the ACLU on Government Censorship. [1]