Hi, you do not need FaceTime for Android.
Android also has its face to face app.
http://support.google.com/android/bin/answer.py?hl=en&answer=1687799
It is Google Talk, and you can use it to talk or video chat, or text chat, with anyone in another Android, or in a PC/Linux/Mac with Mic and Camera. And there is no need to install any app on the computers, just log into your Gmail and enable Google Chat. If a plugin is needed it will be installed the first time you use the feature.
Of course you can not talk to devices from the Apple Ecosystem, have your friends use an Android, or move yourself to Apple's products. Anything you and your friends prefer.
Good luck.