Here is the simple plugin that allows you to add extra fields to the user profile page (e.g. social media links to Facebook, Twitter, LinkedIn profiels etc).
Extra fields can be easily accessed in your templates like a general wordpress author details:
get_usermeta( $userid, $metakey);
Plugin uses WP’s usermeta table. You can add and edit necessary fields at plugin options section in backend.
In case you need it – you can download it here.
Spanish translation – Maria Ramos