To post a more complex message as a user clients can call the chat.
Once the JSON has been sent to the server visual clients should immediately display the text in the channel, grayed out or otherwise marked to indicate that it is "pending". At some point after that, usually a few milliseconds later, the server will send a confirmation that the message was received:. Replies to messages sent by clients will always contain two properties: In the case of a reply to a chat message, if successful, the reply will contain the canonical recorded timestamp of the message.
All messages within a single channel are guaranteed to have a unique timestamp which is ASCII sortable.
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Once a successful reply has been returned, the message in the chat log should no longer be grayed out - it has now been delivered. Chat message replies also contain the message text, which may vary from the sent message due to URL detection. If there is an error processing an event the message server will reply with an error. Clients can send a typing indicator to indicate that the user is currently writing a message to send to a channel:.
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This can be sent on every key press in the chat input unless one has been sent in the last three seconds. Learn all about presence subscriptions and batch presence events here. Clients should try to quickly detect disconnections, even in idle periods, so that users can easily tell the difference between being disconnected and everyone being quiet.
When there is no other activity clients should send a ping every few seconds. To send a ping, send the following JSON:. You can supply any number of extra "flat" arguments that is: These will be included in the pong message that is sent back. For example, a client could include a local timestamp in the ping message so it can calculate round-trip latency:.
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The message server will disconnect any client that sends a message longer than 16 kilobytes. This includes all parts of the message, including JSON syntax, not just the message text. In an online world characterised by chronic lack of security, this is unquestionably a good thing because sending unencrypted messages across the open internet is like sending your most intimate secrets via holiday postcards. Not only could the state or its agents read your mail but so too could the postman and the person who sorted your mail.
For a long time, the transparency of most internet communications proved a boon to state agencies and criminals alike. But the arrival of mainstream encryption makes life much more difficult — for both parties.
For their part, law enforcement and intelligence agencies are caught in a bind. On the one hand — because they see at first hand the horrendous consequences of our current unencrypted online world — they realise that there is an overwhelming public interest in making our personal communications private. Finding a rational way through this thicket would not be easy at the best of times. What can people see on your Facebook profile? To find out, go to your profile, and select View As… from the menu button on the bottom right corner of your cover photo.
So how do you know which embarrassing photos might be visible to non-friends or friends? On the left-hand column, click on Photos , then select Photos of You. Or, you can untag yourself. Facebook also added a new page that breaks down various privacy-related FAQs earlier this year. Many factors contribute to what shows up in your News Feed, such as the people you interact with most and the number of likes and comments a particular post receives.