At the moment no
I dont think you can but you can delete an inbox message which will probably clear the chat?
Just slide the unwanted message or chat to the left and press delete
Add people as friends, and when they are on facebook, they will appear in the Chat menu in the bar at the bottom. Click on someone's name to chat with them.
no they will not.
In the chat sidebar, go to options -- advanced settings. You can then see the list, "All your friends see you except:" and you can delete them out.
It cannot be deleted, but it can be hidden. Click on the settings icon (looks like a mechanical cog) and select "hide". If you wish not to be contacted in facebook chat, then deselect "available to chat".
u log on2 facebook, then u ask someone 2 video chat by posting it.
If you access the facebook help center, you can find step by step instructions on how to delete chat messages. Rest assured, your messages are safe from your wife if you follow the directions given by the help center.
if there name is on chat
You cant. There is no options on Facebook to change the sound.
In Facebook, you cannot "like" something someone says on a chat. However you may "like" something someone says on a post or comment :D