A button maybe next to the icons above the chat box which will pop up and show all the info of online players on the world so you can get in touch more easilier and also have options when you click a player to add as a friend or maybe refresh the list. To add the player just click the box of the players info which will highlight it and click the add button. If you press the refresh button it will show there current location and level this automaticly refreshes but not so often incase you dont have the technology, but this could be pointless if you have the technology because you can set it where players location/level are instantly changed soon as they enter different area or level. If you refresh and the info is disappeared it means the player has gone offline or if a new player comes on it will show his/her info.
example.
Players Online: 2
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Season
Merchant
level 6
Village of Dragon Head
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oOboothyOo
Barbarian
level 3
Dragon Head Mines
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(Add player button) (Maybe refresh play info button)
I'm bad at suggestions and explaining them but if you don't understand or like it, its ok.