At any point in the day, at least one person writes a Tweet that includes the exact time.
By tapping into this stream of morning wakeup times, bus schedules, calls to prayer, ETAs, “OMG, it’s already [time]!” and other time-related tweets, a new site called Chirpclock has created a clock that posts time using tweets.
Using the Twitter API, Chirpclock searches the social network for whatever is the current time on the user’s computer. Users in different time zones, in other words, see different clocks. The site displays one result from its queries at a time, and the time tweets flash across the screen in two-second intervals.
Read the complete article at Mashable.