Etymology
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internet (n.)
1984, "the linked computer networks of the U.S. Defense Department," shortened from internetwork, inter-network, which was used from 1972 in reference to (then-hypothetical) networks involving many separate computers. From inter- "between" + network (n.). Associated Press style guide decapitalized it from 2016.
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netiquette (n.)

"proper style and manners in communicating on the internet," 1993, coined punningly from net, short for internet + etiquette.

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netizen (n.)

"user of the internet," considered as part of the whole community of users, 1995, from net, short for internet + citizen.

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cybercafe (n.)

"cafe that offers Internet access on its computers," or (later) via Wi-Fi on customers' computers," 1994, from cyber- + cafe.

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brb 
by 1996, internet chat acronym for be right back.
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OMG (interj.)

also omg, internet chat abbreviation of oh my God, by 1994. (Earlier in computerese it meant Object Management Group, 1989, a consortium which helped pave the way for the modern internet.)

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webmaster (n.)
1993, from web in the internet sense + master (n.).
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btw 
internet abbreviation of by the way, in use by 1989.
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website (n.)
also web site, 1994, from web in the internet sense + site.
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click-bait (n.)
internet content meant primarily to lure a viewer to click on it, by 2011, from click (n.) + bait (n.).
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