Abstract: In one embodiment, a method includes launching, by a client system of a first user, a video-call session to enable a video stream for display in a small-overlay-window on a display of the client system of the first user; receiving, by the client system of the first user, a video stream comprising video from a client system of a second user; determining at least one property for the small-overlay-window based on information associated with the second user; and displaying the video stream in the small-overlay-window, wherein the small-overlay-window is customized based on the determined at least one property, and wherein the small-overlay-window is positioned directly over an interface of an active application running on the client system of the first user.

Abstract: In one embodiment, a method includes determining, by a computer server machine, that a callee-user is available for a communication session based on location information associated with a client system of the callee-user; sending, by the computer server machine, in response to determining that the callee-user is available, a notification to a client system of a caller-user indicating that the callee-user is available; receiving, by the computer server machine, a request from the client system of the caller-user to initiate the communication session; establishing, by the computer server machine, the communication session to enable a media stream comprising media captured at the client system of the caller-user to be received at the client system of a callee-user; and sending, by the computer server machine, the media captured at the client system of the caller-user to the client system of the callee-user.

Abstract: In one embodiment, a method includes determining, by a computer server machine, that a callee-user is available for a communication session based on location information associated with a client system of the callee-user; sending, by the computer server machine, in response to determining that the callee-user is available, a notification to a client system of a caller-user indicating that the callee-user is available; receiving, by the computer server machine, a request from the client system of the caller-user to initiate the communication session; establishing, by the computer server machine, the communication session to enable a media stream comprising media captured at the client system of the caller-user to be received at the client system of a callee-user; and sending, by the computer server machine, the media captured at the client system of the caller-user to the client system of the callee-user.

Abstract: In one embodiment, a method includes sending an availability-notification a caller-user in response to an occurrence of a trigger event; establishing a call session to enable a media stream comprising media of the caller-user that is of a first type to be received by a callee-user; sending the media of the first media type to the callee-user; re-establishing the call session to enable a media stream comprising media of the callee-user that is of a second media type to be received by the caller-user; and sending the media of the second media type to the caller-user.

Abstract: In one embodiment, a method includes determining an occurrence of a trigger event; sending a notification to the caller-user; receiving a request from the caller-user to initiate the call session; establishing the call session to enable a media stream of the caller-user to be received by the callee-user; and sending the media stream to the callee-user.

Abstract: In one embodiment, a method includes launching, by a client system of a first user, a video-call session to enable a video stream for display in a small-overlay-window on a display of the client system of the first user; receiving, by the client system of the first user, a video stream comprising video from a client system of a second user; determining at least one property for the small-overlay-window based on information associated with the second user; and displaying the video stream in the small-overlay-window, wherein the small-overlay-window is customized based on the determined at least one property, and wherein the small-overlay-window is positioned directly over an interface of an active application running on the client system of the first user.

Abstract: In one embodiment, a method includes launching, by a client system of a first user, a video-call session; receiving, by the client system of the first user, a video stream including video captured at a client system of a second user; and displaying the video stream in a small-overlay-window on a display of the client system of the first user, wherein the small-overlay-window is positioned over an active application.

Abstract: Embodiments of methods, systems, and storage medium associated with selective content delivery to a client device are disclosed herein. In one instance, the method may include sending by a computing device a lock mode signal to a messaging service hosted by a second computing device, that the computing device has entered a notification lock mode of operation that restricts the computing device from receiving at least some messages from the messaging service; and maintaining a communications connection between the computing device and the messaging service during the notification lock mode of operation of the computing device despite severing a logical connection between the messaging service and an application operating on the computing device. The logical connection was used to enable the message delivery from the messaging service to the application. Other embodiments may be described and/or claimed.

Abstract: In one embodiment, a method includes determining an occurrence of a trigger event; sending a notification to the caller-user; receiving a request from the caller-user to initiate the call session; establishing the call session to enable a media stream of the caller-user to be received by the callee-user; and sending the media stream to the callee-user.

Abstract: In one embodiment, a method includes launching, by a client system of a first user, a video-call session; receiving, by the client system of the first user, a video stream including video captured at a client system of a second user; and displaying the video stream in a small-overlay-window on a display of the client system of the first user, wherein the small-overlay-window is positioned over an active application.

Abstract: In one embodiment, a method includes sending an availability-notification a caller-user in response to an occurrence of a trigger event; establishing a call session to enable a media stream comprising media of the caller-user that is of a first type to be received by a callee-user; sending the media of the first media type to the callee-user; re-establishing the call session to enable a media stream comprising media of the callee-user that is of a second media type to be received by the caller-user; and sending the media of the second media type to the caller-user.