You can add this item using iframe. To do that just go to https://soundcloud.com service, choose music that you want to get, click "Share" button and copy code from "Widget Code" field and paste it into your theme using "Column" item from Content Builder.
You can add this item using iframe. To do that just go to https://developers.facebook.com/docs/reference/plugins/like-box/ service and get code for your facebook profile. After set up everything just click "Get code" button, choose "Iframe" and copy code into your theme using "Column" item from Content Builder.
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This is just an example of icons that you can use. All available icons you can find on http://fontfabric.com/social-media-icons-pack/