In this busy world, where time is money, twitter was guaranteed to be a success.
With only 140 characters allowed per update, everything becomes short and sweet, meaning a quick scan over your timeline and you have just been updated on all the latest news.
And it only took less than a minute.
Perfect way to let everyone know of that competition you are running, or to remind them that tomorrow is that big product launch.
All in less that 140 characters.