What’s a Black Hat tactic that’s no longer effective?

Previously common "SEO" methods that no longer work

Socialbookmarking spam

Mass article "ezine" spamming/submission using spinners
 
Using fake registration user data. Companies really push you to jump through hoops for registration details to get as much verified info from you as you don't want to give them. Less are companies that just require an email to get ahead on their platform.
 
Keyword stuffing is not as effective as before.
 
Blog commenting (keyword stuffed in one comment)
 
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