Yes but this way is not vary simple, follow this step:
- Go to admin panel
- Go to "Themes Manager"
- Go to "Social Network" under Base Theme
- On left menu go to Elements->main_menu.ctp
- Go to "Copy" button (on top of code), and copy this file into Blue Theme
- Return to "Themes Manager"
- Go to "Blue Theme"
- On left menu you will find the file Elements->main_menu.ctp
- Add element on list of items like
<li <?php if ($this->request->controller == 'home') echo 'class="current"';?>>
<a href="/my url"><i class="icon-link"></i> My menu</a>
</li>
you must copy the file Elements->main_menu.ctp into Blue Theme, because when you update Social Network Plugin the file will not overwrite.