Schedule SMS, WhatsApp, and Facebook messages? I would like to know if there is a way to schedule SMS, WhatsApp, and Facebook messages to be sent sometime in the future after composing them. Ideally, if some messages would have had to be sent while the device was powered off, I would like the message sending to be triggered automatically on start-up (configured to the particular app or service used to send the message).

I'm thinking of using an app to send respective intents to each app.

Is it possible?
An app called Tasker, for rooted phones can schedule SMS messages. According to its site, it can also be configured for Facebook Messenger, though I have not tried it.