Starting today, hashtags will be clickable on Facebook. Similar to other services like Instagram, Twitter, Tumblr, or Pinterest, hashtags on Facebook allow you to add context to a post or indicate that it is part of a larger discussion. When you click on a hashtag in Facebook, you'll see a feed of what other people and Pages are saying about that event or topic.
Now you can:
• Search for a specific hashtag from your search bar. For example, #NBAFinals.
• Click on hashtags that originate on other services, such as Instagram.
• Compose posts directly from the hashtag feed and search results.
Facebook says it will continue to roll out more features in the coming weeks and months to help people more easily discover what others are saying about a specific topic and participate in public conversations.