Top Definition
Sunday nights, right before the work week begins, when almost everyone you know gets on Facebook giving an artificial boost to the amount of friends normally seen online
dude it's Sunday night i gotta check Facebook to make sure i didn't miss anything from the weekend. oh look everyone else i know is on guess it's the Sunday Night Effect

i have like 10 assignments due tomorrow (Monday)... hmm wonder what's happening on Facebook..
by ajax2220 February 07, 2010

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