These are the sneaky ways apps like Instagram, Facebook, Tinder lure you in and get you 'addicted'

If you own a smartphone, you've likely experienced the feeling: you've got a few moments of downtime so you take out your phone to see what's new.  Maybe you feel an urge to see what your friends are up to, a need to connect to other people. Maybe you want to squeeze in an extra bit of reading or language-learning or mate-finding or game-playing. Does this mean you are addicted to your smartphone? Not necessarily. There are technical definitions of addiction that don't apply to...