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2:51 he purpose of link directories

3:45 A main problem: they're copies of each other

5:07 Suspicious names

6:12 Same IP address

Episode that explains IP addresses: https://www.youtube.com/watch?v=stMe4nMrem4&pp=0gcJCR0AztywvtLA

6:54 Link farms

7:25 Description of a link directory

8:32 Can link directories help you?

9:16 Why do they have directories linking to them?