You will need to add the SocialPusher servlet to webappsrootWEB-INFweb.xml (or uncomment):

<!-- SocialPusher api servlet - start - -->
<servlet>
    <servlet-name>socialpusherapi</servlet-name>
    <servlet-class>com.red5pro.socialpusher.SocialPusherApiServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>socialpusherapi</servlet-name>
    <url-pattern>/socialpusher/api</url-pattern>
</servlet-mapping>
<!-- /SocialPusher api servlet - end - -->