There is no way for the host of the chat to select whose face appears largest when he is talking; the service chooses the speaker, and sometimes it chooses incorrectly, so you are left staring at someone’s blank face while another person is talking.Those who have used Google Hangouts will find themselves longing for that service’s array of party hats and mustaches.Navigation within the streaming site, especially if you want to scroll down a page or highlight text, can be a little clumsy; you are basically using a virtual mouse on a virtual version of Google’s Chrome browser, and the cursor can be finicky.

I worry about Snapchat because it creates the illusion that something can disappear from social media--and that is really dangerous. We keep hearing about people losing their chances at jobs or school admission because their prospective employers or admissions officers go online and check them out. I didn't really mind, but it was definitely one of those note-to-self moments. D., is a pediatrician and Medical Communications Editor at Boston Children's Hospital .

The biggest two lessons that youth need to learn--actually, that everybody needs to learn--about social media are: 1. They look at publicly available stuff--tweets, Facebook posts, etc--and they don't like what they find. Anything we email or post or text or send can go anywhere.

The heads of the people in the video chat float below the shared screen.

A group text chat can pop out from the right side of the website, if you don’t want to interrupt the audio.

The way the app is set up, someone can take a screen shot. We just don't think about this stuff as we are posting and tweeting and sending photos and texts.

While theoretically the sender should be notified if a screen shot gets taken, it only took me a couple of minutes on Google to find hacks that would allow me to take screen shots or save video without the sender knowing. A couple of days ago my 20-year-old son took a screen shot of a text conversation we'd had and posted it on Facebook.

There’s nothing quite like snuggling up with a friend — or friends — and streaming a movie on Netflix.

But what if those Netflix buddies are spread out around the world?

How, then, can you enjoy a film together, cracking wise and taking in each other’s reactions?

new service called Rabbit aims to bridge that geographical gap for Netflix watchers everywhere.

We are all doing it, actually: making judgments about people based on what they post.