You use this every day to talk to relatives, run your business, get special offers, pay bills, sign up for services, anything and everything is done through this medium. Heck, people use it to sell you things all the time, and you buy through them more often than you think.
And it's free. There's no pitch. Just use it: http://roofermarketingsolutions.com/your-most-underrated-free-marketing-tool/