What is twittering?

People learning English have the possibility to receive „One Word a Day“ via email in order to improve their vocabulary.

The word of today is funny, I wouldn’t have thought that it makes its way into regular vocabulary so fast:

Your word for 20th March 2009 is

* * * twittering * * *

Please choose the correct definition and click the link.

a) whistling or humming the same tune over and over
http://www.owad.de/check.php4?id=2260&choice=1&sid=1181682

b) sending short electronic texts to let people know what you are doing
http://www.owad.de/check.php4?id=2260&choice=3&sid=1181682

c) nervously tapping the foot or leg as a sign of impatience
http://www.owad.de/check.php4?id=2260&choice=5&sid=1181682

Happy guessing!

So what do you think it is? 😉