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In footer.php i have these elements:

how i can make the links work below:

<a class="rss" href="facebook.com"><i style="font-size: 13px;" class="fa fa-rss fa-fw"></i></a>
<a class="tw" href="twitter.com"><i style="font-size: 13px;" class="fa fa-twitter fa-fw"></i></a>
<a class="fb" href="facebook.com"><i style="font-size: 13px;" class="fa fa-facebook fa-fw"></i></a>
<a class="yt" href="youtube.com"><i style="font-size: 13px;" class="fa fa-youtube-play fa-fw"></i></a>
<a class="insta" href="youtube.com"><i style="font-size: 13px;" class="fa fa-instagram fa-fw"></i></a>
<a class="goo" href="google.com"><i style="font-size: 13px;" class="fa fa-google-plus fa-fw"></i></a>
<a class="env" href="contact.php"><i style="font-size: 13px;" class="fa fa-envelope-o fa-fw"></i></a>


Because when i click on facebook icon it redirects me to www.my-site.com/facebook.com

But i want when i click on facebook icon to redirect me to www.facebook.com

makes the links with http://
It should be like this:
<a class="rss" href="https://facebook.com"><i style="font-size: 13px;" class="fa fa-rss fa-fw"></i></a>