I agree with Swathi's allegation that the proliferation of online services is affecting our social interactions. Before the internet era, a person would (out of need) socially interact with several people viz. the banker, the clerk at the railway booking center, travel agent, the clerk who accepted the utility bills, and so on. Today, interactions with such people have dwindled a lot.
The amount of time spent online has also gone up significantly, per a recent study. This decreases the available time for outdoor activities.
However, social communities like Orkut, Linked-In, special interest groups have opened up new avenues for social interactions. And, it would be more appropriate to say that, today, social interactions have become more voluntary and mutual-interest-driven, than need-based.