Adding more than one custom social media icon to the theme.

I found this tutorial here: http://kriesi.at/documentation/enfold/custom-social-icons/ to be helpful, but…
I need to add more than just one new icon. I found 2 of the icons I need on Fontello, and the other 2 icons are .png files. I’m confident I’ve set up everything correctly in the css, but the functions.php coding has me a bit flummoxed because I am not a PHP developer, just winging it here. So this is the code I have:

// Add new icons as options for social icons.
function avia_add_custom_social_icon($icons) {
	$icons['Baidu'] = 'baidu';
	return $icons;
	$icons['Lenovo User Community'] = 'luc';
	return $icons;
	$icons['Wechat'] = 'wechat';
	return $icons;
	$icons['Weibo'] = 'weibo';
	return $icons;
}
add_filter('avf_social_icons_options','avia_add_custom_social_icon', 10, 1);

But only the Baidu option is showing up in my theme options list for Social Profiles.
Screenshot
I’m guessing that’s because I don’t have my list of icons coded correctly in functions.php. Can anyone help me sort this out, please?