Hi there,
You can add the following CSS code into
Backend > EasySocial > Themes > Custom CSS and see how it goes:
#es .es-stream-meta .es-stream-title {
font-weight: bold;
}
Do clear all of your cache before you see the changes.
For your information, can you update the site details for
http://stunet.co.za so that we can have a better check of it if needed?