In another mark of the increasingly digital life of teenagers, more than 25 percent of those who dated said their love interests threatened or harassed them online or using texts, according to a new study said to be the most comprehensive look at the phenomenon.

Teenagers reported that their social networking accounts were hacked without permission, that they were texted about unwanted sex and that they were pressured to send sexual or naked photos of themselves.

In the study, published online this month in the Journal of Youth and Adolescence, researchers concluded that digital technology was not the cause of abuse by teens in a relationship, but it provided a 24/7 platform for abuse, often outside the view of adults.

“The technology opens up a wide avenue for someone who wants to be abusive toward their partner,” said Janine Zweig, lead author and researcher at the Urban Institute. “It’s another tool abusers can use to be relentless.”

The study was based on survey responses from 5,647 students in 10 middle and high schools in New Jersey, New York and Pennsylvania. Nearly two-thirds of the students said they had a romantic partner or had one during the previous year.

Most of the digital abuse or harassment from dating partners did not happen during school hours. Seventeen percent took place at school, but “it could have been at the dance or the football game,” Zweig said.

Nearly 6 percent of teenagers said their partners had posted embarrassing photos of them online, and 5 percent reported their partners wrote “nasty” comments about them on the partner’s profile page.

“The survey is important in that it provides hard data to confirm what we already know – that domestic violence and dating violence occur where we live our lives,” said Cindy Southworth, founder of the Safety Net Project on technology at the National Network to End Domestic Violence. “These days, the digital world is our real world, and for teens even more so.”

In the study, more than 80 percent also reported psychological abuse, more than half reported physical abuse, and one-third said they were sexually coerced. Four percent said they were harmed only in digital form.