Figure 2
It uses lines to show collaborations between different countries. The map's most prominent features are the thick, dark lines originating from the United States, indicating its strong collaborations with China, Australia, and the United Kingdom. The map highlights the United States as a central hub of collaboration, with significant ties to several countries across different continents. The thickness of the lines appears to represent the strength or volume of these collaborations. The countries are also colored in varying shades of blue, to indicate their level of involvement, with the United States appearing in the darkest shade. Other countries with notable collaborations include the United Kingdom, China, and Australia, all of which are connected to the United States via prominent lines.Country collaboration map, social media domain. Source: Bibliometrix output