Well, Facebook has joined the hashtag fray.
The Facebook newsroom article tells us
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.
I could go on about this but you get it, right? #herestoanevenmoreclutteredfacebook