I sure do.
Im a computer genius.
I know two ways. And a way to track every text gps web history call log in someones phone sent to yours without them knowing you are tracking them.
You will need to know when they made their gmail account, what contact they contact the most via hangouts,email etc. What labels they have in their gmail mainly trash, inbox, sent etc.
And the last password you think they used.
This only works if they use gmail to log into facebook.
Reason being you do the whole forgot password in gmail. Answer the following questions above correctly and they allow you access to gmail.
Once you get into gmail. You do forgot password on facebook and they email you asking to make a new one in the gmail account you hacked.
But side note your changing the password on both account so this person will be locked out. And can report a hack where you will be locked out if they notice really fast, so you need to do this quick. Thats only if they are a facebook addict.
Best way to do is go into facebook and account settings download facebook data. Which will give you everything ever done on facebook into a zip file. Now you have record along with a copy to view offine and they can lock you out but you still have all their data.
Another way is to have a rooted android.
Now the whole tracker in their phone is another long story lol