The algorithm change by Instagram is significant as it aims to promote originality, which could either positively affect user engagement by encouraging more unique content creation or negatively by reducing the volume of content shared. The impact on META's stock price in the short term is uncertain, as it will depend on how this change is received by both content creators and consumers. Elon Musk's reaction, while not directly impacting the stock, highlights the broader industry conversation around content originality on social platforms.