Whether you know why they are there or not, it’s pretty safe to say we all see a #hashtag or a two on a daily basis. They’ve spread from their native Twitter to almost every other social sharing platform in just a few short years (fun fact: the first hashtag was tweeted by Chris Messina in 2007.) But what do they really do? Even though all hashtags come in the same format, the purpose and function on each network is different. The general consensus throughout all social networks is we should be using hashtags, so here’s a list of how the top 5 social platforms use hashtags, and which ones will give you the most #bangforyourbuck when it comes to visibility and engagement.