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Posts: 594 | Thanked: 1,094 times | Joined on Aug 2012 @ Rhine
#1723
it's explained here:
https://www.whatsapp.com/faq/en/general/20951546

blue checkmarks showed up yesterday evening in android client for me.
maybe this change is how they track inofficial lients?

edit: this new "feature" was available without updating the app.

Last edited by Leinad; 2014-11-06 at 08:53.