Monika Shreves was the victim of a mean girl when she was growing up.

Monika Shreves was the victim of a mean girl when she was growing up.

Rebecca Drobis-for The Washington Post

In college, Shreves got a Facebook friend request from a girl who had bullied her as a kid. Surprised, she accepted. "She was perfectly nice," Shreves recalls.

In college, Shreves got a Facebook friend request from a girl who had bullied her as a kid. Surprised, she accepted. "She was perfectly nice," Shreves recalls.

Rebecca Drobis-for The Washington Post

"When you get to college, it's no longer appropriate to be mean to girls your age. Most of the mean girls we knew grew up to be normal," says Liz Funk, author of "Supergirls Speak Out," a book about overachievers.

"When you get to college, it's no longer appropriate to be mean to girls your age. Most of the mean girls we knew grew up to be normal," says Liz Funk, author of "Supergirls Speak Out," a book about overachievers.

Rebecca Drobis-for The Washington Post

Marie Diop moved to Washington from Senegal when she was 11. She encountered mean girls in high school. Like Shreves, she was later contacted by one of those girls through Facebook.

Marie Diop moved to Washington from Senegal when she was 11. She encountered mean girls in high school. Like Shreves, she was later contacted by one of those girls through Facebook.

Rebecca Drobis-for The Washington Post

Diop, 20, talks with fellow Montgomery College student Dagmawit Mengesha. Diop is president of the college's student senate.

Diop, 20, talks with fellow Montgomery College student Dagmawit Mengesha. Diop is president of the college's student senate.

Rebecca Drobis-for The Washington Post

Diop says her experiences with mean girls "gave me the guts to confront anybody."

Diop says her experiences with mean girls "gave me the guts to confront anybody."

Rebecca Drobis-for The Washington Post