Extend core functioanlity

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Hello

I am trying to extend font-awesome icons class which are located in Concrete\Src\Sharing\SocialNetwork\ServiceList in getServices function.

I have tried by doing Core::bind in bootstrap\app.php but it is not working.
Also I have tried by setting another service to link and got the same result is there any way to extend that classes I need fa icons without squares.

Thanks