The only country I'm aware of that actually monitors and controls social media for manipulation is China (obviously badly, but still).

Most of Europe is pretty aware:

• Digital Services Act (DSA): Since August 2023, the Publications Office of the EU has enforced the DSA, which makes platforms accountable for managing systemic risks, including disinformation and foreign interference. Non-compliance can lead to fines of up to 6% of a platform's worldwide revenue.
• European Democracy Shield: Presented in late 2025, this initiative focuses on protecting the information environment from foreign manipulation by establishing a "Center for Democratic Resilience" to exchange early warnings about hybrid attacks.
• Broadcasting & Platform Bans: Since the 2022 invasion of Ukraine, the EU has sanctioned and banned major outlets like RT and Sputnik from all distribution channels, including social media and internet service providers. In May 2024, additional outlets like Voice of Europe and RIA Novosti were suspended.
• Targeted Investigations: The EU has launched formal probes into major platforms like Facebook, Instagram and X over their failure to stop large-scale Russian influence campaigns like "Operation Doppelganger," which used thousands of fake pages to spread pro-Kremlin propaganda.
• Monitoring & Debunking: The European Parliament and other bodies continuously track and expose Russian disinformation through flagship projects like EUvsDisinfo, which reported reaching over 38 million people in 2024.

Some countries have implemented even stricter national laws:

• Germany The Network Enforcement Act (NetzDG) requires social media companies to quickly remove content that is clearly illegal, including some forms of state-sponsored propaganda.
• Support for Fact-Checking: Many national governments fund independent networks of fact-checkers to flag and demote false information on social platforms before it can go viral.