When you're running a social media agency, it's easy to get caught up in vanity metrics. Clients are eager to see results and your team is eager to prove the value of their efforts.Unfortunately, putting early emphasis on things like followers, likes, impressions, and views only paints a small portion of the picture. You have to frame your strategy in relation to all of the social media key performance indicators (KPIs) clients care about.On YouTube, there are several metrics you can monitor - from video views to impressions and click-through rates. However, there is one metric in particular you should