At the same time... there 54,700 calls made and 114,122 emails sent.
The number of social media shares is almost double the number of people that followed through with the "call to action" here. Why?
If you are publicly passionate about the cause, I think you would do both (social media share + contact legislator). If you were privately passionate about the cause, you would just do the later; contact legislator.
But what is your mindset if you share this via social media, yet don't actually follow through with the call-to-action yourself?