How Many #’s To Use? Not sure how many hashtags to use? Well, the truth is each social media platform is based on a different algorithm so the numbers vary! Follow these general numbers: 1. Up to 30 Hashtags for Instagram 2. Up to 3-5 for Facebook 3. Up to 2 for Twitter 4. Up to 6 for LinkedIn 5. Up to 20 for Pinterest #hashtaghashtag #usinghashtags #howtousehashtags