Ask.com and Answers.com are bigger culprits than all of your list put together.
google this: site:answers.com "can you answer this question"
32,200,000 of their 103,000,000 answers pages DO NOT HAVE AN ANSWER! They are spamming google’s users to get them to build answer.com’s database of answers. (and surrounding the non-content with heavy ads!)
For the pages that do have an answer, answers.com has gone the way of answers.yahoo.com. (I guess you forgot answers.yahoo.com too)
And, BTW, ask.com is just regurgitating answers.com!!
google this: site:ask.com answers.com
or just surf around ask.com to see that they just regurgitate ALL of the content farm results, which makes ask.com a "content farm" farm
your list was a good start, but you missed the biggest (by far) offenders on the internet.
google this: site:answers.com "can you answer this question"
32,200,000 of their 103,000,000 answers pages DO NOT HAVE AN ANSWER! They are spamming google’s users to get them to build answer.com’s database of answers. (and surrounding the non-content with heavy ads!)
For the pages that do have an answer, answers.com has gone the way of answers.yahoo.com. (I guess you forgot answers.yahoo.com too)
And, BTW, ask.com is just regurgitating answers.com!!
google this: site:ask.com answers.com
or just surf around ask.com to see that they just regurgitate ALL of the content farm results, which makes ask.com a "content farm" farm
your list was a good start, but you missed the biggest (by far) offenders on the internet.