Yep, seven years ago, on March 21, 2006, co-founder Jack Dorsey sent the first-tweet and Twitter was born.

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Perhaps the most important term in the Essential Twitter Dictionary we published last week is “hashtag.”

A hashtag, or “#”, denotes a keyword or topic on Twitter. It’s any string of characters without spaces.

Some of the most popular hashtags from the past few months are: #NFL, #Election2012, #BlackFriday and #CyberMonday.

Hashtags are the quickest and easiest way to search for and find out what Twitter users are currently talking about. They’re also key to productive Twitter engagement – hashtags put your tweets in front of the people who are interested in them.

But how did it all start?

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Back in 2006, Glass and Williams were co-founders of Odeo, a podcasting platform, which suddenly looked like a terrible idea when Apple’s iTunes came along. Williams asked his team to come up with a different idea.

Alongside current Twitter Executive Chairman Jack Dorsey and developer Florian Webber. Glass created Twitter – he came up with the name (confirmed by Williams last night on Twitter here) – and Williams liked the product enough to put Glass in charge. Soon, it became his obsession, and Glass wanted to spin Twitter off from Odeo as its own company.

A few months later Williams, frustrated and tired of Odeo, bought the assets of the company back from the investors. Those assets included Twitter, Odeo was renamed Obvious, and Williams promptly fired Glass.

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