Users are asked to share their location with Tinder so the app can recommend people within a certain distance. To make that feature work, Tinder has to record the last known location of each user.
Serotonin is known to be the most responsible in terms of neurotransmitters and depression. Serotonin is responsible for an array of functions most importantly being the mood and perception of a person.
The major neurotransmitter systems are the noradrenaline (norepinephrine) system, the dopamine system, the serotonin system and the cholinergic system. Most other neurotransmitters, on the other hand, e.g. glutamate, GABA and glycine, are used very generally throughout the central nervous system.