The hashtag: what an incredible invention. Many people credit Twitter with its origination, but that isn’t true. It was used on programs like IRC long before, allowing users to switch from room to room on their network.
However, when Twitter needed a way to group conversations and implement and effective, live search feature, they chose the hashtag as their foundation. Not only did they successfully integrate the grouping method, but they made it into something entirely new and innovative.
Now hashtags are everywhere, even being used in popular culture where there is no direct significance. You can use them for any number of things, but you always want to do so smartly. These tools will help you out:
Via Brian Yanish - MarketingHits.com