Answer:
Studies show that people who spend a significant amount of time on social media experience increased anxiety and decreased self-esteem. Watching everybody else's milestones and achievements fly through your feed doesn't make you happy for your pals, it makes you unhappy about your own (seeming) lack of accomplishment.
Explanation:
Sti stands for Sexually Transmitted Infection. It is referred to sexually transmitted diseases.
The answer to this one should be cancer
