Why are people increasingly feeling alienation and depression?

too many are sitting on the computers and not having actual human contact.

I think there are two major reasons:

Lack of social support. Family members and friends move away. People used to have an extensive social network. Or people isolate by watching too much TV or using the computer - you used to HAVE to get out & play cards or go for a walk or something, which led to talking to others.

media - now you can compare yourself to others. Most folks shown on TV are prettier, stronger, younger, smarter or richer than us, or at least seem to be. So then everybody feels like a loser, like we don't have enough. You can't be the best anymore, because on TV we see the best of the best, and almost nobody measures up. The TV is on all the time, too, which just makes it worse.

OK that's what I think. Isolation and we can't feel like we're the best at anything.
I think that the world is changing.NO more do we trust our neighbours...everyone has a hidden agenda. so trust goes out the window.
Depression comes from being unhappy so If you are depressed why not make some changes in your life.
JOIN a club where the emphasis is on social outings.
A church group will provide the support you are looking for.
I think sept 11th changed the world and how we view our neighbours.
Instead of mistrusting people trust them until they prove that they are untrustworthy.
I think that people today are out for what they can get and not what they can give.
for a major reason that they have become alot more materialistic and shellfish and that does not leave any room for communication and undrstanding. there is an endless hunt for getting more and more no compassion.
Those feelings come when you don't do much in the house, don't go out ,no activities in general.
Basically the world is changing ,evolving and you remain the same until you get old and die without having done anything good for people.Why don't you do something to change things,your reason is depression,but it's a false one.
Alienation is typical for people who think too much about what's wrong with them and on that basis they try to reject themselves..
Basically you need to change these faults,if you're talking about yourself.
Life
It comes from lonliness. I have 3 children so im never truly alone, but i have depression because i am never in adult contact. My husb works 11 hours a day minimum, and i stay at home. we used to live in germany, so i have like 1 friend where we live now, and shes half an hour away, and even though i am kinda a loner and bookworm, it is hard not to get depressed when you do nothing for fun whether it is because you have no money, or no friends, or whatever your situation is.