What do overalls, Mariah Carey's Christmas album, and hashtags all have in common?
Believe it or not, they are all products of the 90s.
While hashtags didn't rise to popularity (with the help of Twitter) until after 2007, they were actually first used during the late 90s to
Since then, you've seen them, you've used them, but it's likely that you're not quite sure why.
You're not alone.
While the concept has been around for a while, the social application of hashtags is still a relatively new concept for . And like most new things, hashtagging has left us with a ton of questions.
How many is too many? How long should they be? Where should you use them? And perhaps most importantly, why should you use them?
For answers to all of your burning hashtag questions, . Not only have they laid out the basics for hashtagging on Twitter, Instagram, and Facebook, but they also dive into some tips to help you run a successful hashtag campaign.
![A Brief History of Social Advertising [Infographic]](http://53.fs1.hubspotusercontent-na1.net/hubfs/53/00-Blog_Thinkstock_Images/history-social-ads.png)