Facebook is the world's largest social network platform.

GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications.

Glympse is a fast, free, and simple way to share your location in real-time. You set who sees you and for how long.

LiveTalkie is a free VOIP platform.

Holiline Reminder is a free software calendar program for Windows.

FreezeCrowd is a social networking site for college students and alumni.

Libertree is a free, libre, open-source software that lets people create their own social network.

Badoo is a dating-focused social network.

Google Spaces is a cross-platform application for group discussions and messaging.

Find My Friends is an application and service to find current locations of friends.