Add Facebook Feature: Share Button

[shaunanoordin]

Facebook Feature Update.
Required functionality for Minimum Viable Product.

• Each Subject (image) will feature a Facebook "Share" button.
• Clicking the "Share" button should open a new window, allowing the user to Share the image on his/her timeline.
• Postback link from the FB Share will direct interested users to the Talk page discussing the image.

To discuss:

• At which stage of the workflow does the Share button appear? All the time, or only at the end, when asked "Would you like to talk about this image?" ?
• What default text/content should appear as the Share text? ("Hi, check out this galaxy!" ?)