Vanity Metrics — If you think they are worthless, you don’t know your work.
When referencing social media, a vanity metric is broadly defined as any analytics measure that is not a signifier of real performance. Common examples are the number of followers, likes, and comments. More important than these, are numbers such as reach, click-through rates, and visitor-to-lead conversions. So yes, by this definition, vanity metrics by themselves are worthless.