Around two in three teenagers have admitted sending a text to a member of their family while sitting in the same house, according to a survey
Research by travel rewards firm Avios also found a similar number spend an average of two hours a day on social media, with more during the school holidays.
The study involving 2,000 youngsters also found that family time was more likely to consist of watching TV than eating a meal together at the table.
Psychologist Dr Aric Sigman said: “These results indicate that children are clearly spending more of their spare time in the virtual world, reinforcing the need for families to take stock and ensure children spend more time in the real world.”
One in seven of those questioned also said they would not last an hour without using social media, with three out of four saying they could not last a day.
Earlier this month, a report from the Office for National Statistics revealed children who spend more than three hours each school day on social media sites are more than twice as likely to suffer poor mental health.
The study, involving children aged 10 to 15, also found those who used platforms such as Facebook, Twitter and Instagram on a school night, are twice as likely to suffer.
The questionnaire measured emotional symptoms, conduct and behavioural problems, hyperactivity/inattention, peer relationship problems and sociable behaviour.
According to Public Health England, children face social problems such as loneliness, depression, anxiety, low self-esteem and heightened aggression as a result of overusing computers.