The vast majority (94 per cent) of respondents said they believe there has been a decline in the correct use of English, with four in five identifying youngsters as the worst culprits.
The research found that more than half of British adults are not confident with their command of spelling and grammar.
Almost three quarters of adults are now dependent on emoji to communicate with each another, as well as spell checks and predictive text.
A spokesman for YouTube said that English language tutorial videos are seeing a huge surge in popularity. Since April 2017 there has been a 126 per cent increase in views of English language lesson videos on the site, they added.
Lucy Earl, whose YouTube channel English With Lucy has over a million subscribers, gives tips and advice to those looking to improve their language skills.