Yes, that number startled me as well - it is so far beyond Dunbar's number that it must represent the result of some automatic collection process. Perhaps Gmail

Yes, that number startled me as well - it is so far beyond Dunbar's number that it must represent the result of some automatic collection process. Perhaps Gmail harvests all the email addresses passing through your inbox and stuffs them into the contact list? I imagine that most people using Android phones are less persnickety than I am about allowing Google to manage their lives, so I can imagine that Google might be routinely shuffling large numbers of "contacts" around, which the user of the device neither knows or cares about.