Glide is an app/online service that allows 'video texting,' films that can be either sent live or recorded and sent later. This is a private messaging that is free to use and launched in spring 2013.
Glide allows you to record and send an unlimited number of videos that can be viewed by the receiver can even as you're recording them. The glide app is known for being easy to use. You don't even need Wi-fi, as films can be sent over a standard internet connection.
The ability to record video messages makes Glide more versatile that Skype, which depends upon your caller being available to chat at the same time as you.
Move Over, Facebook?
Glide's use as a 'video walkie-talkie' has made it popular in the early teens demographic, who want an alternative to a service like Facebook, which they consider inflexible, impersonal and something they are 'forced' to use when accessing newer services, such as Glide, as an authentication mechanism. As of late summer 2013, the company has now committed all its development resources to building out an alternative to Facebook, or maybe even a replacement.
Here's a tutorial on how to use Glide: