Writing about technology

It seems to me that technology has changed the world. One century ago, it was very difficult to communicate to another person in another country, but currently, you can make a call to a friend in any part of the world very easily and fast. Also you can use the internet to communicate by chat, SMS and social networking sites like Facebook. Although, It can be a problem if you can't control this with responsibility. For example, in some jobs, you can't work and see your profile in Facebook at the same time. But in general, technology is useful because you can work online, study online or play games online. Definitely, technology has changed our lives.