The Power of Keywords & Hashtags in Social Media Marketing What Exactly Is A Hashtag? These tags aren't just a bunch of words at the end of a caption. We'll discuss the purpose of these keywords in social media and what makes them effective tools for developing a strong social media strategy. We’ll also explore how they impact social media advertising and how they help discoverable and community-based content in this article. Hashtags are different for each platform. For example, on Instagram, you can add a remark with your associated hashtags and use 10 or more. However, it's recommended that you use only a few hashtags on many other platforms, and you can only add them to your caption, with no revisions allowed after the post has been published.