The internet is a double edged sword. Facebook and other social media sites have permanently changed the way that people stay in touch and interact. In some ways they are a good thing because they have made it easier to stay in touch with and update friends and family about things that are going on in life, but for many people these sites have taken the place of actually getting together, spending time, and doing things together. From what I've seen people are much more likely to update their status, or post something on someone's wall than actually pick up the phone and talk to someone, or to drive across town and sit down and have a cup of coffee with someone.
Sure, site's like this one give those people that are extremely shy or shut in's the capability to "get out" and interact with people, but at the same time they also give those extremely shy people the excuse to not take the next step and develop "real" friends.
As far as dating, I see that the internet has really opened up the opportunities for single people to interact with a broad spectrum of other singles that the would never have met otherwise. I know of numerous couples who are happily married that wouldn't have met without the internet. Of course the whole long distance relationship thing has it's pro's and con's and some people just aren't up to the challenges involved.
As far as the affects that the internet has had on me personally, I have found it to be a good thing. My internet use was pretty minimal prior to finding this site, just checking e-mail or searching for information. I came here during a time in life where I was a "financial shut-in" I was unemployed and really couldn't afford the fuel, etc to get out and see friends. Since then it has opened up doors both socially and for ministry. Simply put, some of the people that I hold in highest regard both as friends and brothers and sisters in Christ are people that I interact with here, and there are a few of those that I definitely would like to meet in person if the opportunity arises.