SOI (Sphere of Influence) is a concept that refers to the people in a person's life who have the most influence over them. This can include family, friends, colleagues, and other people who have a significant impact on their thoughts, feelings, and actions. Social media platforms are often used to connect with and expand one's SOI. Social media allows individuals to interact with others, share information, and build relationships, which can help to expand their sphere of influence and connect with people they may not have had access to otherwise.