@smartmax: It is possible, however it will take you quite much time on this modification. As you might know that the icons are the background image containing the icons, thus you will need to:
– Add/edit the new 2 social icons in background image (http://www.applicatietechniekvanderwal.nl/nieuw/templates/ja_mitius/images/social-icon-top.png).
– Go to the Social module (Custom HTML) and add the codes to load 2 new social icons with the same format. i.e
<li class=”facebook first”><a href=”#” title=”Facebook”>Facebook</a></li>
– Using the background-position property to locate the new icons on correct <li> tags.
Hope that helps.