The unique landmark - which is made up of 40,000 interlocking basalt columns - in County Antrim, just off the north coast, attracts hundreds of thousands of visitors every year, making it no surprise that it was the tourist attraction with the most hashtags.
The Giant's Causeway was made a World Heritage Site by UNESCO in 1986 and form the beautiful famous landscape from columns, which look like stepping stones that lead all the way from the foot of the cliff and go under the sea. The columns are impressively hexagonal, whilst others have four, five, seven or eight sides and the biggest are a whopping 12 metres high.
Coming second on the list was Mourne Mountains with over 109,000 hashtags. In County Down, this mountain range is home to Slieve Donnard. It also has a 22 mile long dry-stone wall.
In third place, The Dark Hedges has sailed towards the top of the list due to it being a film location for popular HBO series, 'Game of Thrones'.
Francine O'Hagan, Sales & Marketing Manager at Maldron Hotel Belfast City, who conducted the study, said: "This survey tallies up consistently with visitor numbers to The Giants Causeway visitor centre and caused no initial surprise. This attraction continues to be one of the most popular in the north, especially with foreign tourists. I also expected the Dark Hedges to feature on top considering the huge popularity of 'Game of Thrones.'"