I guess different people have different definitions of this term, but to me the term socialization means "exposing your bird to new environments, experiences, birds and people"
This is easiest to do when the bird is young. A well socialized baby bird will be set up for life. It is possible to socialize a mature bird but if they were not socialized as babies, they can develop irrational fears and will not be comfortable in new environments. They may startle easier. They may become more defensive. They may never be comfortable outside of a "known territory". This really isn't fair to the bird because a lot of birds will have multiple homes throughout their lives.
I do believe it is important to "safely" socialize your bird as much as possible. If you think about it, in the wild, most species of parrots fly and are constantly exposed to new sights, sounds and experiences - these are experiences that we can barely imagine. Parrots are very visual and intelligent creatures.
Does any body have any ideas how they can safely socialize their feathered friends?