This week on Twitter, birthday FLOTUS Michelle Obama debuted a new haircut, Lindsay Lohan strategized on how to gain followers and Selena Gomez "met" Michael Phelps, but by the looks of her accompanying photo, she may have found his personality a little, um, flat.

Meanwhile, Ralph Lauren played with puppies, Cathy Horyn documented crazy menswear on the runway in Paris and Amy Poehler met Mr. Rodham Clinton at the Golden Globes.

Take a look at the tweets below and see more of our favorite Twitter moments:

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