Back in the old days, say in 2009, Twitter was a relatively unknown social network that was beginnign to spread like wildfire. In 2007, Twitter users posted some 400,000 tweets per quarter, by June 2010, they were posting 65 million each day. Today, there are 200 million registered users who send around 400 million tweets every day.
During this short time, Twitter has become so popular that its technical argot has entered the common language. Words like hashtag and @name would have seemed little more than gibberish just a few years ago. But even the word tweet is now a verb officially recognised in the Oxford English Dictionary.
