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Each Facebook Chat user now needs to be notified whenever one of his/her friends (a) takes an action such as sending a chat message or loads a Facebook page (if tracking idleness via a last-active timestamp) or (b) transitions between idleness states (if representing idleness as a state machine with states like "idle-for-1-minute", "idle-for-2-minutes", "idle-for-5-minutes", "idle-for-10-minutes", etc.).
Note that approach (a) changes the sending a chat message / loading a Facebook page from a one-to-one communication into a multicast to all online friends, while approach (b) ensures that users who are neither chatting nor browsing Facebook are nonetheless generating server load.
Gaddafi has controlled Libya for more than 40 years, since 1969.
Tunisian dictator Zine El Abidine Ben Ali was in power from 1987 until January 14, 2011, when he was forced to step down and flee the country.
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.
However, to be on the safe side, it is better simply to turn it off completely. From there, it is also advised that you check out the latest revision of the Definitive Facebook Lockdown Guide (shameless plug, I know) to ensure that as much information on your profile is restricted, allowing nobody outside of your friends list can access your information.
Many Libyan Internet activists have declared their support for the pro-democracy movements and revolutions in the Middle East.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.Regarding Chrome OS, Jobs pointed out that Google was building off of the open-source Web Kit engine, which Apple created.Asked if Apple would be removing Google from the i Phone, Jobs responded that it wouldn’t. What I love about the marketplace is that we do our products, we tell people about them, and if they like them, we get to come to work tomorrow. the people who make those decisions are sometimes confused….