Remove duplicate contact information After merging contacts from different sources like Facebook, Twitter, Exchange and Google+, it was apparent to me that now my contacts contain a lot of duplicate information such as the same email addresses, birthday date, website address.

Ideally, all those redundant entries should be merged as well so not to clutter things.

I've looked almost everywhere but could only find information relative to just merging issues with contacts.

(If it matters, I am using Android 2.3.)
Visit the Contacts app in a desktop browser and sign in with your Google account with which your device is getting synced.  Once done (you should have successfully synced your contacts before this), the more button (as seen in the image) has option to merge.