A、She didn’t seem to be doing as well as her Facebook friends. B、She spent more time updating her friends than her family. C、She

Katherine loved Facebook. With Facebook she could stay connected with her family, no matter how far away they were. She could see their photos and read their status updates. With Facebook she could keep her relatives up-to-date on what she was doing.
    [19] Another thing Katherine loved about Facebook was that she didn’t have to think about time zones when updating family. Whenever she called her parents or other relatives, she always had to think about the time difference so that she wouldn’t wake someone up or call when she knew they were at church. Facebook was so convenient.
    When Katherine joined Facebook, some of her classmates at high school started to add her as a friend. At first, this didn’t bother her. She loved learning about the success of people she knew when she was just a teenager. [20]She loved finding out people were getting married, having babies, and traveling.
    Soon however, Katherine found herself comparing herself with the people she was reading about on Facebook. [21]It began to make her feel bad that some people seemed to be doing so much better than she was. She was also spending a lot of time on Facebook. It took a lot of time and energy to keep up with everyone’s status updates.
    Katherine started to think. She looked at the list of over 500 friends she had on Facebook and realized some of them were not really friends at all.
19. What was one particular convenience Katherine loved of Facebook?
20. How did Katherine feel when her classmates added her as a Facebook friend?
21. What made Katherine feel bad about herself later on?