From @wikipedia, retweeted by @wikimedia:
v1: Celebrating the 10th anniversary of Wikimedia Commons (@WikiCommons) https://blog.wikimedia.org/2014/09/05/celebrating-the-10th-anniversary-of-wi... 22+ million images that anyone can use freely
v2 (later) Wikimedia Commons turns ten years old! Read more: https://blog.wikimedia.org/2014/09/05/celebrating-the-10th-anniversary-of-wi... + an upload of the logo (from https://commons.wikimedia.org/wiki/File:Commons-logo.png / https://commons.wikimedia.org/wiki/File:Commons-logo.svg )
From @WikiCommons, retweeted later by @wikipedia and @wikimedia:
Wikimedia Commons was launched ten years ago today! https://blog.wikimedia.org/2014/09/05/celebrating-the-10th-anniversary-of-wi... + an upload of https://commons.wikimedia.org/wiki/File:Martian_Dust_Devil_Trails.jpg (or one one of the other PD images featured in the post)
FB/G+ (Wikipedia/WMF): On September 7, 2004, Wikimedia Commons was launched as a central repository for images used on Wikipedia. Today, it contains more than 22 million media files that can be freely used by anyone. https://blog.wikimedia.org/2014/09/05/celebrating-the-10th-anniversary-of-wi...
FB/G+ (Wikimedia Commons): Wikimedia Commons was launched ten years ago today! Read about the first ever photograph uploaded in 2004, and see a selection of the decade's finest images: https://blog.wikimedia.org/2014/09/05/celebrating-the-10th-anniversary-of-wi...