Final answer:
To avoid negative reactions on social media, follow communication competencies such as considering your audience, being discreet, and thinking about the long-lasting consequences of your posts.
Step-by-step explanation:
When using social media, there are several communication competencies you should follow to avoid negative reactions. First, consider your audience and the impact your message may have on them. What you find funny or harmless may not have the same effect on others. Secondly, be discreet and mindful of the content you share. Emails and posts can easily become public, so think about how your words and actions may be perceived by others. Lastly, remember that everything you post online can have long-lasting consequences. Consider how your social media presence reflects your talents and skills, and whether you would be proud to have potential employers or college admissions officers see your posts.