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A sock puppet is an online identity used for purp`1oses of deception

In Internet slang, someone who posts inflammatory, extraneous, or off-topic messages in an online community, such as an online discussion forum, chat room, or blog, with the primary intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.

Also known as bashing, is hostile and insulting interaction between Internet users, often involving the use of profanity. Flaming usually occurs in the social context of an Internet forum, Internet Relay Chat

Goodwin's law is often cited in online discussions as a deterrent against the use of arguments in the widespread Reduction and Hitler form reference may sometimes be appropriate

Spam is the use of electronic messaging systems to send unsolicited bulk messages indiscriminately