It’s quite possible many of us will always imagine Taylor Swift as the 16-year-old blond twang-voiced ingenue who burst on the scene and wowed the industry with her precocious songwriting. So it may shock you that she has a full 21 years on her now. Well, it wouldn’t be a surprise if you’re one of the 4.7 million people following her on Twitter — she let the world in on her celebration last Monday. What else did Twitter teach us? So much. Look at you, Twitter. Just schooling us this week, that’s how much we learned. Click ahead for all the great insight sent across the interwebs 140 characters at a time.