Fill in the blanks: To determine which social media channels to spend time on, you should start with a social media audit. Then, you should analyze your competitors' social media presence. Although you can't get data on your _______, which is the most important, you can analyze your _______ rate and publishing _______ among other metrics.

The correct answer is "link clicks, engagement, frequency." While you can't directly access a competitor's link clicks (which is a crucial metric for understanding traffic generation), you can analyze their engagement rate (likes, comments, shares per post) and their publishing frequency (how often they post). These observable metrics provide valuable insights into their strategy and audience response. "Community size" and "conversion" are often difficult to ascertain accurately for competitors, and while "conversion" is important, "link clicks" is a more fundamental measure of direct traffic generation from social media. "Engagement rate" is a measurable metric, but the blank refers to something you can't get data on, making "link clicks" the appropriate choice there.