Chat with friends, play games, watch music videos, watch television shows and/or movies, do some reading (online stories, articles, poetry), do some digital artwork on various sites, hang around here and answer questions, write emails to penpals, shop, take care of virtual pets, make music, edit photos on various sites, make e-cards, etc.
listen to music, chat rooms,play the sims, (watch por n, if your into that) research things that you are interested in, post pictures, paint, photoshop
Im read interesting stuff,make a social networking account such as a twitter,facebook,myspace,tumblr.playing cool games is also good when your bored.
Go on the a social network, play games, come on funadvice take pictures, edit pictures, research interesting stuff, listen to music...
a lot of you are missing the point...
he asked what to do on a pc, not what to do on the internet.
well ive just activated my eyefinity and im off to play some left 4 dead 2 on our server
social networking,youtube,adult filmography
u can also paint if u like painting ^^
and u could do some online shopping