The Frenchman, who currently plays for MLS side New York Red Bulls, has set a picture of his statue outside the Emirates Stadium as the header on his profile.
The 36-year-old, who had gained over 60,000 followers less than 30 minutes after his first tweet, announced his arrival this lunchtime:
Hi this is Thierry Henry. This is my only official Twitter account. Everything posted on here will be my views. Welcome.— Thierry Henry (@ThierryHenry) May 12, 2014
Henry is Arsenal's all-time leading goalscorer, and also earned 123 caps for France during his international career.