In a small update, you can now program a route into Google Maps and share it in a variety of different ways, as well as toggle terrain features.
Google Maps picture by Google
In the new Google Maps, which should be accessible now, sharing a route is as easy as creating it, pressing the options button, and hitting "Share". If your favourite sharing option isn't there (I use Chrome for Facebook instead of the Facebook app to get around its silly Messenger push), one could easily SMS it or Google Drive it and then share from there.
You can also toggle satellite and terrain features in the options menu -- useful if you think there's something the bird in the sky might see that the maps app hasn't.