Hi there,

You can do custom css override on css below or you can do template override on this files .../components/com_easysocial/themes/vortex/toolbar/default.php

[gist type="css"]
#es .fa-home::before {
content: "\f015";
}

#es .fa-users::before {
content: "\f0c0";
}

#es .fa-comments::before {
content: "\f086";
}

#es .fa-globe::before {
content: "\f0ac";
}
[/gist]

Please give it a try and see how it goes.