Cast a glance at Facebook will be less than one minute. We all have this kind of thought, but then we will find that we will spend several hours on watching video, taking comments, browsing news, and so on. If you are like this, it needn’t to be say as it is a nature of course.
The constitution of human’s brain makes it continually seeking for unpredictable return, surfing online is a action of it. Due to the reason of Internet can be available at everywhere and every time, it makes people hard to overcome this kind of temptation. Addicting online is not the same as drug, but it also hard to say no.
Person needs social activities, so we often use e-mail and SNS to contact with friends. From the reward theory, e-mail is some like the gambling: most of them are useless, but once it is, you will get high return. The Ivan Pavlov experiment of conditioned reflex has also shown this fact. Just like the dog do action to the ring bell, we have similar movements when we get IM or Facebook messages.
There is an interesting survey: 80% of people will hold their breath while browsing e-mail and other important files. It is a nature reflection of human’s body to the potential surprise. However, it is not a healthy action if it is active usually.