Run gMail's auto-merge contacts feature now to save your sanity

If you've been using gMail for any length of time, then do yourself a favor and use the Find & merge duplicates feature. There is almost no risk now that Google's added the Restore contacts feature!

If you're an Android user, then you should get a double-win by condensing contacts in both places.  

Step 1

Click Contacts. Click More menu. Select Find & merge duplicates.

Step 2

Click Merge button. You can click the expand link to see more details about the merges.

That's it.