Final answer:
Social media posts examples in the lecture teach us about the impact of social media on society, social change, and potential dangers.
Step-by-step explanation:
The lessons from social media posts examples in the lecture teach us about the impact of social media on society, particularly in the context of sociology. It demonstrates how social media is a powerful force for social change, as seen in examples like the Arab Spring and McKenna Pope's petition. Additionally, it highlights the potential dangers of social media, such as the spread of fake news and manipulation of voters by foreign operatives.