A communication system can include terminal devices that communicate with a social network or a computer server device for scheduling use of conference resources and/or for using conference appliances that may be located in a conference room being used for a video conference or teleconference. The communication system can be configured to permit a user to use such resources without having to have a user's device be physically and directly connected by wiring to a conference appliance or communication device. The communication system can also be configured to validate participants to help ensure that only authorized personnel are properly attending a scheduled conference based on audio and/or video input received for the different participants and can also be configured to allow screen sharing to be performed during a video conference or teleconference.