The number of people here using WhatsApp to send messages jumped by 5% over the past six months, according to the latest Ipsos MRBI Social Messaging Quarterly.
79% of adults here now have WhatsApp installed on one or more devices, with three quarters of those using it daily, up 1% since June.
Facebook Messenger, on the other hand, saw no increase in user numbers here during the same period, with 59% of adults still using it.
However, daily use of the Facebook messaging platform fell two points to 45% over the six months.
Skype and Snapchat both saw their Irish user numbers fall though, with around a third of people now accessing them.
Elsewhere in the social networking space, the number of Facebook users grew 4% over the second half of the year.
Two thirds of adults now use the app, with 64% accessing it daily, down 1% since the last survey.
Instagram remains the second most popular platform with 43% of adults holding an account, up 2% since June.
But the number of daily users of the picture sharing service fell 1% over the same period.
LinkedIn and Pinterest recorded the biggest level of user growth during the six months, with both up 5%.
Twitter saw no increase in account ownership and remains at 30%.
6% of adults now have a TikTok account, up 4% since the last survey.
43% of those people use it every day, a 10% increase since the middle of the year.
The Social Messaging and Networking Trackers are based on a telephone survey of 1,000 adults aged over 15 years, carried out every two weeks.