Social networking service Twitter is celebrating its 7th birthday Thursday.

Seven years ago, the first tweet was sent over a private social networking website. Now, the San Francisco-based company has more than 600 million registered users who generate more than 340 million tweets every day.

On the company's blog, Editorial Director Karen Wickre posted: "There's an old English saying, 'Keep a thing seven years, and you'll always find a use for it.' Today is Twitter's 7th birthday, which we observe on the day @jack first tweeted. Since then, we've seen breathtaking velocity in Twitter's growth, which is due entirely to your many uses of it. We're gratified that so many millions of you have made Twitter yours."

You can follow 10News on Twitter @10News.