I don't think this is new... I mean you need a way to contact your friends - mobile phone and facebook are the most effective ways now a days. You need something to do, going out, whenever it is just getting outside, going to parties, pubs or going at conventions or anything, is one main thing to do with friends.
Cell phone and going out is a bit of a must, I mean, how else are you going to contact with your friend? Sitting in your house all day, waiting for them to come by every now and then, without going anywhere?
Moving to Equestria- when is the next train again...?
what is a 'modern concept of friendship'? that doesn't make any sense with the things you listed there. people have always made friends the same way, they meet people, and have fun together. modern things like cellphones and facebook have just made it so contacting your friends is easier and faster. if you don't like going out, then you can contact your friends somehow and invite them over to your house to do stuff.
Technically, no - well, except for the last point. Introverts are often described as more focused on their own thoughts and perceptions than on their environment. I guess you could dislike a particular type of environment (eg the drinking-driving-bookfaceing) without being introverted, you could just be extroverted and prefer doing something else. But in my case, I'm definitely introverted
Personally, I don't think drinking and driving should have anything to do with making true, honest to God friends.
If you don't have a cellphone, then the next best thing you can do is go on outings, join a club, etc. etc. Maybe try to become a better public speaker by practicing in the mirror, or become active in a sport you're truly interested in.
at this time and age all those things are necessary to keep an efficient contact. I remember back then, when I went to elementary school, I only saw my friends at school, or if I invited them home. Usually I played out in the garden with all my friends that lived close enough. I guess it's kinda important that you do make some kind of effort to be part of your friends' lives. I didn't use to drink back then, but lately I do, and I go to parties with old friends, and I enjoy myself. It's not a must to drink if you go out, but it's kinda boring to just sit and stare at walls. Drinking, dancing, entertaining yourself is part of the evening. They call me to go to town, shopping, coffee time, they write to me in fb etc. I find cell phones necessary because everybody can find you. Back in the old times people had (and even today) house phones, but you couldn't bring them with you if you went outside, and nobody could contact you 24/7. Surely it has its pros and cons. I don't have my own car and I surely don't believe that it's necessary in order to have friends.