Groups of Friends in orkut is one way of saving you a little extra effort. Once you group your friends into appropriate groups, such as "family", "college" or "best friends", you can later interact with all these people at once, in a single click.
When you manually select a bunch of friends to send a single scrap to, a "save as group" button will show up right there:
Save it, giving it any name you want, and that's all: the new group will now be available to you at anytime in the top of your homepage, in case you want to send more messages to these friends later on.
Also, if you choose a group but add or remove some recipients before sending out the group scrap, the "save" button will also be there, in case you want to make these changes to the existing group you've chosen or if you want to save these recipients of your scrap as a new group.