Tips on deducing a person in the internet:
•Observe
~Observe the person's moves and how he/she communicate.
•Talk
~Talk to the person freely like you two are friends or like when you confess your feelings or whatever.
Then try to lure him out using your words that will surely corner him/her.
•Remember
~Haven't you thought that maybe this person that you are deducing is your closest friend or maybe one of your classmate in school.Isn't He/she familiar or what?
•Spill
~Spill your deductions if your feeling is true,Ask him/her questions over and over again until he surrender.
