©IDG Communications, Inc. Photo contributed by Matthew Mikaelian.
Five years ago today, Twitter cofounder Jack Dorsey blasted off the very first tweet. What began as an experiment in “microblogging” — no more than 140 characters, please — has become a cultural landmark.
Twitter now has 200 million users, including tech luminaries, celebrities and the president of the United States. It started off slowly: In 2007, Twitter averaged just 5,000 tweets per day. But in 2009, the site hit a tipping point and became a broadcast channel for major news events.