According to a poll by British YouGov, folksonomy is the worst - in the 'wince, shudder or want to bang your head on the keyboard' sense of that word - cyberspatial word, followed by (in order) blogosphere, blog, netiquette, and blook. (news.com.au: Blook-haters vent rage on Web's worst words)
Personally, I don't mind any of those, save, of course, blook which, frankly, I would vote worst by a mile.
Another hated net-word was wiki, which for some reason always makes me think of (faux) Hawaii songs, kind of like something Elvis would sing:
Elvis: [Hawaii shirt on top; cut from the waist down]And there I saw her ...
choir girls: [while suggestive wiggling their bottoms in a mock-Hawaiian way] wiki wiki wiki ...
Elvis: She said Aloha ...
choir girls: wiki wiki wiki ...
Elvis: And made eyes at me ...
choir girls: wiki wiki wiki-eeeeeee ...
I'm not entirely sure that this hasn't something to do with the general not-so-completely-high regard in which I hold Wikipedia.
I wonder, though, how many of these words we will be using in that far, far distant future ... oh, say, in two or three years time?!