If there is a 10% decrease in friend requests, my first step would be to analyze the data to determine the source of the decline and the demographics affected. This might include looking at the drop across various platforms (such as mobile and desktop), geographic locations, user segments, and specific time periods. I would also investigate any changes to Facebook's interface or features to see if they correlate with the decline. If I find any correlations, such as a specific group experiencing the drop or a decrease that aligns with a feature change, I would focus my attention on those areas. If a feature change is identified as the cause, I might consider reverting it or making additional adjustments. If the data analysis does not reveal the cause, I would then think about conducting user research, like interviews or surveys, to obtain qualitative feedback. Users might be facing challenges, or there could be changes in behavior or expectations that the data does not clearly reflect. Once I identify potential causes, I would create a strategy to address them, which might include improving existing features, launching new functionalities, or incorporating user feedback. After implementing this strategy, I would closely monitor friend request metrics to ensure the decline is stopped and ideally reversed. Continuous monitoring would be essential to prevent the issue from reoccurring and to swiftly identify any new problems that may arise.