groups

[Greg Murphy <slackwares_slacker@yahoo.com>]

I recently switched from slackware to debian. Under slack, when users were 
added they were defaultly added to the group "users". I see debian gives each 
user his/her own group.

1. Why did debian adopt this method? 
2. If say, I want to add two of my users to the same group, is it safe to add 
them to the already existing "users (GID=100)" group, or is this reserved for 
some program that comes with debian?


Thanks.