Hi Peter,
I had the same issue I believe asking for the new Twitter X logo to be implemented. I succeed in downloading a new .svg X symbol from FontAwesome. I have attached see link...
https://easyupload.io/mtsu5w
This then left me with the new logo but the old twitter blue in the Social Share add-in icon.
I have added the following 'custom css' to my Helix Ultimate template to correct the 'X' to black with a 50% lighten on hover. Mine is in RGB format in the CSS code rather than HEX but you can change to what colours you require using the following useful website:
https://hexcolorcodes.org/lighten-color
Anyway my Custome CSS added corrects the Facebook Social Share icon to the new Facebook blue and Twitter to X in black:
.fa-twitter::before { content: url("/images/x-twitter.svg"); width: 14px;
display: inline-block; height: 14px; vertical-align: -0.125em;}
.fa-twitter:hover::before { content: url("/images/x-twitter.svg"); width: 14px;
display: inline-block; height: 14px; vertical-align: -0.125em;}
.sppb-social-share-style-solid ul li.sppb-social-share-twitter a { background-color: rgb(0, 0, 0); }
.sppb-social-share-style-solid:hover ul li.sppb-social-share-twitter a { background-color: rgb(50, 50, 50); }
.sppb-social-share-style-solid ul li.sppb-social-share-facebook a {
background-color: rgb(24, 119, 242);
}
.sppb-social-share-style-solid:hover ul li.sppb-social-share-facebook a {
background-color: rgb(44, 139, 255);
}
The result can be viewed: https://easyupload.io/9szyqp
Hope this helps you Peter :)
Roger