While everyone's being nostalgic about what Twitter means to them, I may as well add my two cents.
I didn't give birth to Twitter – that was Jack and Florian. But I was its midwife and adoptive mother; for two months in early 2007, I was the code's sole guardian and caretaker.
I was also the first person to hate Twitter; back when it was SMS-only, I did the math and realized that my immigrant prepaid phone plan would charge me $2000/year to send and receive even a 2006-era number of tweets. ?