Emotional cheating or an emotional affair is an old concept but does cover cyber or online cheating.
http://en.wikipedia....motional_affair
As far as the quality of online relationships?
Even a normal frienship requires face to face contact and the sense of touch to receive the full benefits of friendship. What happens, on fb for instance, is that we receive dopamine rewards whenever we get a new like or read a new comment, and dopamine is part of our reward system but value-neutral so it will reward us when it thinks we are going to get a pay off, in a normal friendship the pay off is actually having someone before you, that you can see, and touch, because that activates serotonin which tells the dopamine to stop making more because the desired goal is achieved, the warm-fuzzy feeling of bonding.
What happens on facebook is the serotonin never gets signalled in, it never kicks in, thus dopamine keeps pouring in which in the end makes for a less quality relationship, and can even be the start of an addiction.
All dopamine but no actual reward, dopamine just steers us towards rewards, but the dopamine system can be hijacked where one either gets too much of something (salt, sugar, fat) and keeps consuming more, or when one doesn't get enough of something, serotonin in a real world relationship, and dopamine keeps being made toward that end but is never satisfied. This can make online relationships exciting (dopamine rush) but utlimately not satisfying (no serotonin).
Edited by Chasingtherabbit, 14 October 2012 - 06:25 AM.