There are a few different types of Facebook groups that tend to be popular in the United States. First, there are interest-based groups where people with similar interests can connect and share information. These types of groups are popular because they offer a way for like-minded people to connect and find new things to enjoy. Second, there are groups based around current events or topics that are trending. People use these groups to discuss what’s going on in the world and share their thoughts and opinions. Lastly, there are support groups for people dealing with various issues or challenges in their lives. These provide a safe space for people to talk about their experiences and get support from others who understand what they’re going through. Some of the most popular Facebook groups in the US fall into one or more of these categories.