Fox, 29, shared a black and white picture, writing she was "still" there, reported E! Online.
"Hi. I'm still here, I just continue to have an angsty relationship with social media. But what better way to express my apprehension than with a selfie. This time in black n white!" she captioned the photo.
The "Teenage Mutant Ninja Turtles" star, who joined Instagram in June 2014, also shared a screenshot of her first selfie on Facebook.
Fox recently separated from her husband of five years, Brian Austin Green, and filed for divorce in August.
"Some of you may, or may not have noticed by now that my Twitter account has been shut down... I thought that 2013 might be the year I finally blossomed into a social networking butterfly... But as it turns out I still hate it," she had written on Facebook.
The actress will be seen on the fifth season of "New Girl" in a recurring role.
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