A healthy friendship is one where you share your true feelings without fearing the end of the relationship. It's also one where you sometimes have to let things that bug you slide. The tough moments will make you wiser about yourself and each other. They will also make you stronger and closer as friends.

There are no shortcuts to genuine friendship. Relationships are built over time.

There are times in every friendship when you or your friend are too busy to call or are more focused on other relationships. It will hurt, but it's rarely personal. Making it personal usually makes things worse, and being too clingy or demanding can drive a friend even further away. Like people, friendships can get 'overworked' and need to rest.

When girls can be honest with each other, they can make mistakes on their own terms and discover through experience - and not through knee-jerk adult intervention - what a healthy friendship should look like.

If the Internet has been called a great democratizer, perhaps what social media has done is let anyone enter the beauty pageant. Teens can cover up pimples, whiten teeth, and even airbrush with the swipe of a finger, curating their own image to become prettier, thinner, and hotter.

Many of us endure pain in the service of beauty every single day. We rip off our hair with hot wax, jam our soft skin into modern-day corsets, and burn our scalps with dyes.

We have to teach girls communication skills.

I realized that I wanted a Rhodes Scholarship, not because I wanted to go to graduate school but because I wanted to win a famous award. Quitting forced me to realize I was on the wrong track and that I had lost touch with who I was and what I cared about.

I run skills-building programs focused on healthy risk taking, failure resilience, and self-care for undergraduates around the country.

The meteoric rise of the 'wellness' industry online has launched an entire industry of fitness celebrities on social media. Millions of followers embrace their regimens for diet and exercise, but increasingly, the drive for 'wellness' and 'clean eating' has become stealthy cover for more dieting and deprivation.

Failing well is a skill. Letting girls do it gives them critical practice coping with a negative experience. It also gives them the opportunity to develop a kind of confidence and resilience that can only be forged in times of challenge.

Happiness doesn't just happen. It must be pursued. And if the pursuit of the 'ultimate currency' of happiness helps us choose occupations that confer present and future benefit, and these choices, in turn, motivate us to succeed, this strikes me as perhaps the most powerful non-cognitive skill of all.

For the self-conscious or insecure girl, technology can become a crippling addiction, an insatiable hunger not just for connection but the elusive promise of being liked by everyone.

In the so-called age of girl power, we have failed to cut loose our most regressive standards of female success - like pleasing others and looking sexy - and to replace them with something more progressive - like valuing intelligence and hard work.

I was a single mom by choice at 37, and if my love life hadn't quite panned out, most everything else had. I was a classic 'amazing girl' - driven, social, and relentlessly well-rounded - reveling in the fruits of post-Title IX America: an all-metro athlete in high school, Rhodes Scholar at 24, best-selling author by 27.

Social media forces girls to bear witness to painful realities of relationship that were previously hidden from view. It is a new kind of TMI, or 'too much information': publicly posted photographs of an outing or party you did not attend, or a personal web page like Formspring, can send a girl into paroxysms of anxiety and grief.

It never hurts to tell your teen they matter more than their looks.

Intrinsic motivation is one of learning's most precious resources. It bolsters us to stick out the tough moments of a challenge and pursue what we love to do.

All around me, I see girls forced to become rat racers in the College Application Industrial Complex, the subculture where students must craft themselves into the perfect specimens for college admission and often lose their authenticity, love of learning, and sense of self in the process.

Having a baby on my own is a dream come true, but in my world, there's no sheepish spouse on his way home from a work trip to offer me a stretch of alone time.

Most parents would not hesitate to assume responsibility for their child's behavior on a playground, at school, or in someone else's home. What happens online should be no different. Parents should talk with their children about computer ethics, stipulate rules of conduct, and - most importantly - establish consequences.