The New York college's survey shows finds 24 percent of Internet surfers younger than 45 years old have the most regrets.
The poll also finds 21 percent of men say they sent something they wished they didn't, compared to 15 percent of women.
Overall, half of Internet users told the poll that social media like Facebook and Twitter, which helped sink former Rep. Anthony Weiner of New York, do more harm than good. Weiner resigned after he sent racy pictures of himself to women online.
The poll questioned 1,003 Americans from July 15 to 23. It has a margin of error of 3 percentage points.