The "Little Women" actress told The Wrap that she tried Twitter in 2009 because she was a fan of British comedian Stephen Fry, who had an account on the platform.
"I only went on it because Stephen Fry was on it. 'Cause he was like, 'Oh, Twitter, it's fantastic, it's a quick little thing,' and because he got on it, I got on it," she said.
Ronan decided against using the site, deciding that it was "too much work" and "stressful." She continued to explain that she's "developed a kind of distant relationship with my phone and technology over the last couple of years."
And while she didn't stick with Twitter, she said that she understands why others use the platform.
"I get why musicians do it, and journalists or people in the public eye. But acting is a different thing, 'cause you're not yourself when you're working. I'm not me in anything that anyone sees me in," She explained.
The actress continued, "So for me then to get on Twitter and go, 'Oh, I've had a terrible day' or 'God, I've got such a headache,' I just don't think people need to see that. And self-promotion has always made me feel really uncomfortable."