THREE out of every four Dubliners have a Facebook profile - but that figure drops to as low as one in five in areas such as Leitrim and Roscommon.
Digital marketing group Eighty Twenty broke Ireland's 2.2 million Facebook users down by county, and found that the capital is the clear winner - with a massive 75 pc of Dubs owning an account on the world's most popular social network.
In second place is Limerick, with half of all Shannonsiders at least having opened a Facebook account, followed closely by Waterford and Louth.
And even though Cork is the second largest county by population, it only ranks in 7th place.
An earlier study by Eighty Twenty found that Limerick ranks 21st in the highest volume of tweets originating from a county, which either indicates that there's a great deal of inactive Twitter users in Limerick or they simply prefer having the ability to create posts longer than 140 characters.
Ranking at the bottom of the list are Leitrim and Roscommon, where only around 19p own a Facebook account, while about a quarter of those from Laois, Mayo and Clare are users.
Louth and Waterford appear near the top of both studies, which suggests the two counties are highly savvy when it comes to social media, given that a high percentage of their local populations are active on Facebook and send a higher volume of tweets than other counties.
The study also found that in 14 out of the 26 counties in the Republic, just one in three uses Facebook.
Facebook was launched by Mark Zuckerberg in 2004 while he was a student at Harvard University and currently boasts more than one billion active users.
It was the subject of “The Social Network,” a major feature film starring Justin Timberlake which was released in 2010.