Here are a few options for a formal title, depending on your focus:
- Most direct: “Greens Accuse National Party of Disseminating Misinformation”
- More concise: “Greens Allege Misinformation in National Party Social Media Post”
- Formal/Journalistic: “National Party Social Media Content Attacked by Greens Over Misinformation Claims”
Recommendation: The first option, “Greens Accuse National Party of Disseminating Misinformation,” is the most professional and standard journalistic choice.