As we get older, it gets harder to make new friends. We hold our high school and college friends closer; making a new friend seems to take lot of time and effort. We're less willing to befriend someone completely strange to us. The NY Times has some explanations in their article:
As external conditions change, it becomes tougher to meet the three conditions that sociologists since the 1950s have considered crucial to making close friends: proximity; repeated, unplanned interactions; and a setting that encourages people to let their guard down and confide in each other.
The internet might help solve the problem of proximity, and online games can help us have repeated interactions with others, which sometimes results in lasting friendships. As for an intimate setting... there may be some room for games to grow in that regard.