If you would like to chat with someone without waiting a long time for an answer, write to those who are online.
Go to Messages in the upper site menu. Look through all of your chats. A green circle next to the person's picture means he/she is online.
To find all online users quickly, use the Online filter in Messages. Add an "Online" check mark , the chat list will refresh, and you will see only those who are online. To return to all chats, uncheck the "Online" filter, the chat list will refresh again, and you will see all current chats.
Mobile version
From the upper menu, go to Messages. A red circle next to the person's picture means he/she is not online at the moment; a green circle means he/she is online. Tap on the Online button on the right - the list will refresh, and you will see only those who are online right now.