Here are a few ways to rewrite the title in a formal tone, depending on your preferred level of academic or professional phrasing:

• “Questioning the Efficacy of Social Media Bans: Concerns Regarding Lack of Positive Impact”
• “The Efficacy of Social Media Restrictions: Analysis of Limited Impact”
• “Evaluating the Impact of Social Media Bans: Concerns Over Limited Effectiveness”

Recommendation: The first option is the most precise and formal for an academic or professional setting.

Here is a formal revision of the title:

Participation of Minister of Foreign Affairs Radosław Sikorski in the “The War for Minds: Fear, Subversion, Disinformation” Conference at the Sejm

Here are a few options, depending on where you want the focus to be:

Option 1 (Direct and professional): Developer of Fox River Resort Refutes Rumors of Exclusive Resort Policy

Option 2 (More formal/Journalistic): Fox River Resort Developer Denies Allegations Regarding Religious Exclusivity

Option 3 (Concise): Fox River Resort Developer Dismisses Claims of Religious-Only Development

Note: In a formal headline, it is generally preferred to use “refutes,” “denies,” or “dismisses” rather than “calls a lie,” as these words maintain an objective, journalistic tone.