In order to display new social icons, you need to update FontAwesome to latest version. Please follow the instruction to update FontAwesome:

1. Download FontAwesome latest version here:

2. Go to wp-content\plugins\js_composer\assets\lib\bower\font-awesome

3. Upload and override font-awesome.min to 'css' folder.

4. Upload and override all fonts to 'fonts' folder.

5. Save and try again.