When you finish your first session it will give you the option to share on Facebook or Twitter. You will have to sign in to your social media account from the C25K app to integrate the two. After the initial setup all you have to do is share after you finish each workout if you wish. Happy Running!
No, It does not come with music. You can make a playlist and then you can access it through the app.. I have been just using Pandora as I can't figure out music on my Galaxy S5 yet, lol. Hope this helps.