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How to invite a user to a Private MO chat.

I read the following but I do not know how to apply it yet.

Your help is appreciated

https://meta.mathoverflow.net/a/3635/36688

I have to go to chat. Ok but how do I find a user? How create a Private chat room? And how do I invite the user. In the past I participated in chatroom because at the bottom of comment it was written "do you want automatically move to chatroom..." But I do not know the regular chat room invitation method.

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    $\begingroup$ There are no private chats on StackExchange (which hosts MathOverflow). The only exception is that moderators can create a private chat (which is still visible to other moderators on the site), but this is done for moderation purposes only. $\endgroup$
    – Asaf Karagila Mod
    Commented Aug 12 at 14:19
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    $\begingroup$ As @AsafKaragila already mentioned, regular users can only create rooms where the conversation is visible to everybody. But users with enough reputation points can created gallery rooms - on MO this privilege is set at 1k reputation points. In such rooms, you can choose which users are allowed to talk. $\endgroup$ Commented Aug 12 at 18:21
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    $\begingroup$ BTW the posts you linked contains links to: How do I invite a user to chat? (Mathematics Meta) and How do I contact other users? (Meta Stack Exchange) $\endgroup$ Commented Aug 12 at 18:26
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    $\begingroup$ Since you wrote that you " do not know the regular chat room invitation method", I have tried to illustrate this in this chatroom. $\endgroup$ Commented Aug 14 at 7:38
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    $\begingroup$ @MartinSleziak Thanks Martin I went to that room. any way I think 'enough reputation' is needed to invte peiople and determn who can enter the room. how much is the necessary reputation? $\endgroup$ Commented Aug 14 at 7:59
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    $\begingroup$ @AliTaghavi If you're around - and have further questions - why don't we talk in that chatroom. Feel free to ping me here. $\endgroup$ Commented Aug 14 at 8:12

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There are several questions here - so let me comment on them briefly. (This answer is mostly gathering things already mentioned in the comments.)

A very short answer to the question from the title is: If by "private" you mean something visible only to you and to the other user, there isn't such an option (unless you become a moderator). Some related feature requests: Should we request a Private Message system? and Any way to send a personal message to another user?

Various types of rooms

  • Only moderators can create private rooms - the messages posted there are available only to the moderators and to the users that have been explicitly granted access to that room.
  • Even regular users can create gallery rooms - the conversation is visible to everybody, but the room owner(s) can specify who is allowed to talk. To be able to create such a room you need at least 1k reputation points.
  • Regular rooms (with no restrictions) can be created by a user who has at least 100 reputation points. Keep in mind that you can choose various parent sites when creating a room.
  • One can create a one-to-one room - using the button "start a new room with a userXYZ" in chat profile. They are basically the same as the normal rooms - but in the list of rooms they are located at the end (even after the rooms imported from comments).

See also: Is there a list of SE chat privileges, and the minimum reputation required for those privileges?

Inviting user to a chatroom

You asked how to invite a user to a room - one can find the information here:

Or you could simply ping the user in a comment - and include a link to the chatroom in that comment.

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