Introducing Hashtags on Facebook

Facebook announced that it will be introducing hashtags similar to its competitors like Instagram, Twitter,Tumblr, or Pinterest.

Facebook said

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 one 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 clearly mentioned that you control the audience for your posts, including those with hashtags.

Hashtags are just the first step to help people more easily discover what others are saying about a specific topic and participate in public conversations. We’ll continue to roll out more features in the coming weeks and months, including trending hashtags and deeper insights, that help people discover more of the world’s conversations. – Facebook Newsroom