By default, in mobile the notification should "just" be a different color for the buttons (e.g. orange instead of blue in BeSocial! and green instead of grey in Light).
You can add back the indicators to the mobile version too by using a little trick.
In index.template.php search for:
0 => ' <span class="pm_indicator">%1$s</span>',
and change it to:
0 => '</span><span class="pm_indicator">%1$s</span><span>',
Yep, I told you it's a trick.
Then, in index.css search for:
#main_menu .linklevel1>.pm_indicator {
in the section:
@media screen and (max-width: 50em)
and remove the corresponding display: none.
If the theme were based on the Light variant you may have to bring the bubbles down slightly, but it looks based on BeSocial!, so the bubbles should already be at the same position.