Reese Witherspoon would ''investigate'' someone she was considering dating.
The 'This Means War' actress - who married second husband Jim Toth last year - would use social networking websites to her advantage if she were still single.
She said: ''It's a benefit and a curse having social media at your fingertips, where you can investigate the people you're dating.''
Despite the advantages of modern technology, Reese - who has children Ava, 12, and eight-year-old Deacon with ex-husband Ryan Phillippe - admits it once caused trouble in her relationship when a boyfriend accessed her photographs without her knowing and even deleted some of the images.
She added in an interview with The Independent newspaper: ''I had somebody go into my computer without asking me and look at all my photos.
''I thought that was really uncool. And he deleted some of it! I was like, 'What?' I didn't like that.''
The 35-year-old star is amazed at how some people manage to date multiple partners as she has always struggled to find the time to focus on one relationship.
she said: ''I have never dated two people at the same time. I wouldn't know how to keep up with two - I can barely keep up with one!
''Is it OK for a woman to do that? I have no judgement on people who do, as long as they are honest.''