Homestuck is a webcomic that "simulates" the old school type of adventure game where players had to write in commands to make the game progress.
Andrew Hussie simulated that by taking commands form the readers and made the story progress this way, hence its very random nature at its beginning. While in Act 4, he completely stopped taking user commands and since then has written the story and commands by himself
The less you know about it before starting reading it, the better. You might as well give a try now by going there: http://www.mspaintadventures.com/?s=6
and keep clicking on the big hyperlink texts.
DO NOT FORGOT CLICKING ON THE PESTERLOGS AND READING THEM!
Because of its numerous huge walls of texts, it's difficult to enter that at the beginning, so, my advice is to keep reading it up until the end of Act2 (it will take you roughly 40 minutes). If it still doesn't please you by then, then Homestuck is not made for you.
If you want to know more about it, the story in question is about four internet friends who goes through those nicknames:
there is ectoBiologist, EB, the derpy-looking friendly character
tentacleTherapist, TT, the smart ass girl
turntechGodhead, TG, the too cool for school guy
and gardenGnostic, GG, the daydreaming girl who know too much for her own good.
Together, they start playing a game that might have a greater impact on their real lifes than anyone could ever imagine.