(I) Computer gaming
(II) Social / Social networking (Ex. facebook and forums)
(III) News
(IV) Porn/Obcene materials
(V) Others
For me
I > III > II
-I find computer gaming really really addictive, games I like to play are Action, Strategy, and MMORPG.
-Followed by READING NEWS: yes you heard it, I have no reason why, but I crave for a lot of information that seems to be so irrevant to my life, as a result, I literally spend hours digging for useless information on the internet from news sites (Especially CNN.com).
-Lastly social networking: I don't really use facebook or forums; however, in conjunction with playing games, I do seem to have this regular urgency to maintain contact with friends I've made playing the games online. Probably because there is more virtual friends than real friends... Which kinda sux