Glide is climbing up application-store charts, in one case slipping past Instagram, Sarah Perez writes. The video chat app seems to have used address-book spamming on the way to this meteoric rise, but the app has merits of its own such as a live video "walkie talkie" feature and the ability to text video voicemail to others. And "links to the Glide message can be posted on Facebook or Twitter, or sent to others via SMS or e-mail," Perez writes.

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