Here is how it works: Users can set up their own Twitter page by joining the free service on Twitter.com.

VOA: special.2009.02.06

Frankly, I would argue that probably 80%, 90% of the users of Boston Subway just want to buy one damn ticket to get on the subway and yet where is the button that says one-way pass?

坦白讲，我想提出，可能80%，90%的波士顿地铁用户,只想买一张TM的地铁票,来乘坐地铁，但是哪里有一个按钮,指明：“一路通“？

哈佛公开课 - 计算机科学课程节选

This was mainly from selling ads aimed at users based on what they post on Facebook.

VOA: special.2010.05.28

"Lots and lots of companies from overseas, especially from China, selling very cheap products, that users can have in order to recharge their cell phones or small devices, that run on solar energy or wind energy."

VOA: special.2011.01.10

One concrete outcome of the Conference will be to formalize, to institutionalize it so that users can rely on that information.

VOA: standard.2009.08.31