To conserve bandwidth, you want to be able to block social media streaming sites, like Facebook or YouTube via SSL/HTTPS. This article provides the recommended Junos OS version for doing this.
Beginning with Junos OS 12.1X47-D10, Junos OS uses the next generation application identification signatures (also known as App-ID 2.0). With App-ID 2.0, it is able to more effectively detect application signatures for sites that uses SSL or HTTPS as the communication mechanism.