This is actually solution advice from hard won experience.
After THREE days of installing, uninstalling, re-installing, WordPress, Customizr, and Child Themify, as well as creating, deleting and recreating databases and users and endless editing of my style.css I discovered the problem.
If you cannot get the social icons to appear on your sight try this...
I am doing my local development on a WAMP. I also have the ADBLOCK extension installed on my browser. Consequently this affects local development.
I did not think ADBLOCK would block the appearance of the social icons on my local site development. BUT IT DOES! ADBLOCK does not have a whitelist so if you want to keep ADBLOCK, There are three solutions:
1) Pause ADBLOCK.
=> Just remeber to UNPAUSE it when you are done.
2) In ADBLOCK Options/Filter Lists, uncheck "Fanboy's Annoyances".
=> This will disable ALL blocking by Fanboy's Annoyances while surfing the web.
3) Select "Don't run on this page" on the ADBLOCK dropdown menu.
=> IMHO the best overall option for local develpment. Also, you might want to add a front page note to visitors to your site regarding ADBLOCK if you want them to see your Social Icons.