Hey there,

I am really sorry for the delay of this reply as it is a public holiday for us here.

Can you check whether your current template have override this file?

JoomlaFolder/templates/YourCurrentTemplate/html/com_easysocial/helpers/cover/page.php

If yes, try edit this file and replace this from fa fa-thumbs-o-up to far fa-thumbs-up.

If no, can you update your site backend and FTP access at https://stackideas.com/dashboard/site so we can better have a check?