Jennifer Aniston has branded social media "distracting" and "time consuming".
The actress does not have an account on Twitter or Instagram, although her husband Justin Theroux regularly posts images on the photo-sharing app.
Aniston told the Press Association: "I think it's really distracting.
"The amount of time it takes people to probably post all of that stuff, it feels very time consuming. It's just not my thing."
Jason Sudeikis, Aniston's co-star in the new film Mother's Day, said his fiancee Olivia Wilde had changed his opinion of social media.
Wilde, who has 1.7 million Twitter followers, famously got into a spat with Justin Bieber fans on the site after she criticised the pop star for going shirtless on a night out in London.
Sudeikis told the Press Association: "She's good at it. It's not an all-day, every-day thing. She's funny. She speaks about issues.
"I would say she changed my personal opinion of it. I have nothing against it for other people. They can do whatever they want.
"A photo with a comment? Easy. I can handle that. The effort doesn't hurt my feelings. The content? Possibly. It's just not my bag."
Speaking ahead of the release of Mother's Day, Aniston said she agreed to star in the film before reading the script because she wanted to work with Pretty Woman director Garry Marshall.
"It was a fun ensemble, a great group of people involved and it was something fun to be a part of," she said.
Mother's Day is released in the UK on June 10.