Different social media platforms have different rules, norms, and best practices for using hashtags, so you need to adapt your hashtag strategy to each platform and optimize your posts accordingly. For example, Twitter is where hashtags originated and where they are most widely used and searched, so you can use up to two or three hashtags per tweet, but avoid overdoing it or spamming. On Instagram, you can use up to 30 hashtags per post, but the optimal number is between nine and 11. Meanwhile, LinkedIn is a more professional and formal platform, so you should be more careful and selective with your hashtags, using up to three or four hashtags per post that are relevant, specific, and appropriate for your industry, audience, and goals. Hashtags can be used to join and follow trending topics, events, and chats, as well as to create and promote your own campaigns and contests, increase your reach, engagement, and followers, and showcase your brand personality and style. They can also be used to create and join user-generated content campaigns, challenges, and communities, follow and contribute to industry news, insights, and discussions, and build your authority and credibility.