Less anonymity.
Before social media took over the world, there was a trend of blind dates. People would fix you up with their friends that are total stranger to you and you had to wear a specific wardrobe for them to recognize you. You had to date a totally anonymous partner and that is dangerous to some extent because you don’t know if the person you are going to blindly meet the next day turns out to be a serial killer. However, with the invention of social media, blind dates and anonymity has decreased because you can just go to your partner’s social media profiles and stalk them to gather whatever information you need to know.