Approximately 3 months ago, Gmail announced decision to stop automatically adding contacts to your contacts whom you may not even know who they are. Now, they have gone one step further. According to a post on Gmail blog, previously auto-added contacts will be moved into Suggested Contacts.
As part of this change, we're moving previously auto-added contacts back into Suggested Contacts. Only contacts that you've edited, imported or added to a group will remain in My Contacts. This will provide everyone with a clean slate and, we hope, a better point for syncing contacts with mobile devices (for example with Android). We'll be rolling this change out to everyone over the next few days.
More changes to Gmail contact manager [via]
