I distinguish 3 groups of tells.
1)the behavior in the chat people talking about the game, insulting others, complaining of bad luck it is possible to determine the degree of tilt.
2)the time for making decisions. If a person made a decision quickly, and then took a pause - maybe he is thinking about value-bet or preparing a bluff. Here you need to follow his style of play - maybe he plays on several tables
3) all the other tells - he puts a big blind without waiting for the queue - beginners and fish; does the moves automatically: call BB, check fold, automatic raise - plays on several tables, often goes to the sit-out - the game is not particularly interested in.