Or so he jokingly proclaimed. It's hard to tell when there were close to 200,000 replies left on the actress' debut post in the first four hours of its existence.
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But perhaps more telling than even the act of leaving a comment are the contents of said comment.
"Woot-Woot! #first," Theroux wrote, along with a hands-up (praise) emoji and a heart. Yes! A heart.
Aniston's first photo on the app -- a selfie alongside her "Friends" co-stars and the caption, "And now we're Instagram FRIENDS too. HI INSTAGRAM" -- elicited such joy and excitement among her famous and non-famous friends and fans that several people reported having issues following her!