- Search for a specific hashtag the your search bar.
- Click on hashtags that originate on other services, such as Instagram.
- Compose posts directly from the hashtag feed and search results.
Users can still control who sees their posts, even if they contain hashtags.
Hashtags are expected to increase brand interaction. Without hashtags, users were limited to seeing posts by their friends, the pages they had liked, and the pages their friends had liked – as well, of course, as any promoted posts. With hashtags, users are more likely to see posts from outside their immediate circle, but just as likely to see posts which interest them.
For more, see this post about how to use hashtags on Facebook.