Some of these social networks are general interest, some are niche-lifestyle or interest-specific, and others are widely used internationally and have not yet grown in the United States.

As with any social network, much of your Snapchat experience will depend on who you follow, but on this one you're less likely to find carefully composed posts.

Instead, Snapchat all about spontaneity and documenting things "in the now." Or, as the company's founder Evan Spiegel puts it, "instant expression."Navigating the App When opening Snapchat, forget the infinite scroll of the social networks you're used to, because this app immediately springboards the camera to the screen.

Just as spoken words only hang in the air long enough for ears to hear them, these images last just long enough to be seen (or more accurately, for 24 hours) and then they disappear.

Navigating the app also works a little differently here.

Businesses often think of the top four social networks — Facebook, Twitter, Linked In and My Space — as the only game in town.

But there are hundreds around the globe with millions of users who can be targeted via these networks by businesses.

Glass showed that designers working on computing devices that are worn face a different set of assumptions and challenges.

Glass, for example, made it easy for users to surreptitiously record video, which led some restaurants, bars and movie theaters to ban the device.

Glass also showed the potential pitfalls of easily identifiable wearables, perhaps best proven by the coining of the term "Glassholes" for its early adopters.