I recently bought a Google Nexus 10 and created a new Google profile (@gmail.com) associated to it. I never sent any email from it neither received anything except Google's welcome messages.
I added two personal IMAP accounts (full of emails).
Then I installed Twitter (I'm new to Twitter too) which suggested me to add contacts from my "address book", that are actually real people I know.
Does Google look into my IMAP mailboxes to discover my contacts ? If not, how is it possible for it to suggest such friends ?
(My address book is empty - the only existing contact is myself. I also have a Dropbox and Github accounts linked to Android, but these account doesn't store contacts.)
I saw Where exactly does Android get its contact suggestions from? but my GMail address is totally new so nobody has it.