It is rather keeping each online user aware of the online-idle-offline states of their friends, so that conversations can begin.
The naive implementation of sending a notification to all friends whenever a user comes online or goes offline has a worst case cost of O(average friendlist size * peak users * churn rate) messages/second, where churn rate is the frequency with which users come online and go offline, in events/second.
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The web app requires no installation and you can use it on any PC with an Internet connection. Comm100 Live Chat Desktop App supports both Windows and Mac, and is free for your download. Comm100 Live Chat App for i Pad has an intuitive interface that supports both portrait mode and landscape mode views to make online chatting on your i Pad simple and convenient. Comm100 Live Chat App for Android will work on all of your Android-based phones and mobile devices, allowing you to use them to easily monitor and chat online with your visitors as well as set preferences.
You can receive sound & popup notifications for new visitors, chat requests, responses and more. Comm100 Live Chat App for i Phone is specially optimized to run seamlessly in the background on your i Phone and supports push notifications for new visitors, chat requests, responses and other pre-defined events. What’s more, the app pushes notifications to your i Pad when live chat is running in the background. Comm100 Live Chat App for Android is free for your download.
Just tap the video chat toggle in the upper right-hand corner to turn on video.
It’s super easy one-on-one or in a group (up to six people).
This is wildly inefficient to the point of being untenable, given that the average number of friends per user is measured in the hundreds, and the number of concurrent users during peak site usage is on the order of several millions.
Surfacing connected users' idleness greatly enhances the chat user experience but further compounds the problem of keeping presence information up-to-date.
And you can even share content, including photos, stickers, and GIFs in real-time, while video chatting with friends.