What does 'stan', 'lit' and 'worldie' mean?

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F_i_o_n_a 26yo Looking for Men, Women, Couples (2 women), Groups or TS/TV/TG South Glens Falls, New York, United States

The word 'Stan' is being liberally used on social media - most recently to describe Kelly Clarkson's adoration of Meryl Streep. However, a few brave souls admitted they hadn't a clue what it meant. more on Geo altCom
mona63 40yo New London, Wisconsin, United States