The Blackburn theme for Hugo has a bug in how it shows social media icons. Here’s how to fix it.
My friend David Wang also uses Blackburn and he shared with me his solution.
Until the PR merges into Blackburn:
cd themes/blackburn/layouts/partials rm share.html wget https://raw.githubusercontent.com/yoshiharuyamashita/blackburn/186f596907bd6ab0c746631bf8b66978b8072eef/layouts/partials/share.html
Rebuild. Worked for me.