Answer:
14. .edu 15. True
Step-by-step explanation:
14. Edu is used almost soley for college-level information - any content found on an .edu website is most likely to have been created by a proffesor or person with a Master's or PHD degree, making it a very credible source.
15. Unfortunately, there have been numerous studies that social media can cause self-image and mental health issues (on a more subjective note, this is mostly due to society's harmful 'norms' for people).
Hopefully this helped! Good luck!