The following techniques and strategies are commonly used to spread false information on social platforms to defame the reputation of others: 1. **False information and rumors**: Creating and spreading false stories, rumors or untrue information, which may be in the form of news articles, social media posts or videos. 2. **Image and video editing**: Using image editing software to modify photos or videos to distort facts or create misleading visual evidence. 3. **Bot accounts and fake accounts**: Creating a large number of fake accounts, through which they forward, comment and like false information to increase its credibility and reach. 4. **Manipulating public opinion**: Taking advantage of the algorithms of social media to publish controversial content to attract attention and spark discussion, thereby expanding the spread of information. 5. **Malicious tags and keywords**: Using popular tags and keywords to tie false information to hot topics, making it easier to find and share. 6. **Group and community dissemination**: Posting false information in specific social groups or communities, using the trust relationship of the community to increase the acceptance of information. 7. **Emotional manipulation**: Promote sharing and dissemination by stimulating users' emotions (such as anger, fear or sympathy), usually by exaggerating or distorting facts. 8. **Pretending to be a victim or insider**: Pretending to be an insider or victim, and leading others to believe in some false information through personal stories and emotions. These techniques used in combination can effectively spread false information and cause damage to personal reputation. Therefore, the public needs to improve their ability to identify false information and maintain critical thinking about information.