Why do people get addicted to things like TV, Facebook, games? I am studying for exams but there's a TV series I couldn't get enough of. 

Is there any explanation to all addiction thing that happens with our brain?

EDIT
I'm not talking about procrastination but generalized addiction about non chemical(drugs) things that happens with us.
At least two phenomenons can be found here :


The drive to wath the TV series is higher than the drive to study.
The TV series are structured in such a way to attract and hook viewers.


I will try to answer the second :

TV series i.e. soap operas, Lost TV series etc mostly use two components to create addiction to viewers : curiosity and emotionally charged stories.


  Curiosity-drive theory relates to the undesirable experiences of
  "uncertainty". The reduction of these unpleasant feelings, in turn, is
  rewarding. This theory suggests that people desire coherence and understanding in their thought processes. When this coherence is
  disrupted by something that is unfamiliar, uncertain, or ambiguous, it
  is curiosity-drive theory that attempts to gather information and
  knowledge of the unfamiliar to restore coherent thought processes once
  again.


...


  British psychologist Edward B. Titchener (1867–1927) might have argued
  that we become glued to complex, emotionally-charged stories because
  of our ability to recognize the feelings of others. A newly identified
  phenomenon at the time, Titchener coined the term empathy in 1909. In
  addition to identifying others' discomfort or elation, "cognitive
  empathy" examines how humans can also adopt others' psychological
  perspectives, including those of fictional characters.