Registering with Desmos (free) gives you the ability to create, save and share pages (Facebook, Twitter or permalink).
Once you are logged in simply select the disc icon to save. You will then get a link you can share however you want.
For example you could link to a page to illustrate the solution to a problem:

When my Year 12 (age 16-17) students study coordinate geometry I  advise them whilst studying this topic that it can be very helpful to see good diagrams. I created the above slideshow to provide them with diagrams for a set of questions assigned to them and also to show them examples of the syntax to use for the Desmos graphing calculator. Clicking the image on each slide takes you to a Desmos page with the graphs. Several students have said how much this has helped them.