Here are the top external sites that link to Wikipedia, based on overall link volume for all Wikipedia languages and all top-level domains.
Graph by Gianluca Demartini, CC-BY-SA 4.0.

Who links to Wikipedia?

To learn more about who links to Wikipedia, University of Sheffield researchers analyzed the structure of links that point to Wikipedia pages from external websites. Here’s what they found. (…)

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"Leonardo self" by Leonardo da Vinci - www.vivoscuola.it : Home; Leonndardo self, under Public Domain

Wikimedia Research Newsletter, January 2015

Bot writes about theatre plays; “Renaissance editors” create better content

With contributions by: Kim Osman, Federico Leva, Tilman Bayer and Maximilian Klein.

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"Карпатский 05" by Balkhovitin, under CC-BY-SA-3.0

Wikimedia Highlights, December 2014

Here are some of the top stories published on this blog in December 2014. They cover a selection of activities of the Wikimedia Foundation,as well as important events from the Wikimedia movement — from making Wikipedia twice as fast with HHVM to the winners of the Wiki Loves Earth photo contest. (…)

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Isbrytaren_Bore

Wikimedia Highlights, November 2014

Highlights from the Wikimedia blog for November 2014, covering a selection of activities of the Wikimedia Foundation and other important events from the Wikimedia movement

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"Svjatogorsk, Lavra 3" by Konstantin Brizhnichenko., under CC BY-SA 4.0 via Wikimedia Commons.

Wikimedia Highlights, September 2014

Highlights from the Wikimedia Foundation Report and the Wikimedia engineering report for September 2014, with a selection of other important events from the Wikimedia movement

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"WMF Monthly Metrics Meeting October 2, 2014.webm", by Wikimedia Foundation, under CC BY-SA 3.0

Wikimedia Foundation Report, September 2014

Contents
1 Data and Trends
2 Financials
3 Highlights
3.1 Beta test of HHVM
3.2 Greek Wikipedia user wins key hearing in court case
3.3 Community consultation in Brazil
3.4 Damon Sicore joins WMF as Vice President of Engineering

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Examples of Wikimedia programs under evaluation this year. Can you help collect more data? Slide by María Cruz, CC-BY-SA 4.0. Photo by the U.S. Bureau of Reclamation, public domain

Help fill in the gaps: Contribute to the story of Wikimedia programs

The Wikimedia Foundation’s Learning and Evaluation team invites you to help collect data about Wikimedia programs, so we can evaluate their impact. Here’s an overview about this initiative and how you can contribute. (…)

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Breaking up the MediaWiki codebase into separate PHP libraries can benefit many developers across the open software movement. 
Wikimedia Zürich 2014 Hackathon photo by Christian Meixner, freely licensed under CC-BY-SA 3.0.

Modernizing MediaWiki with libraries

The Wikimedia Foundation is breaking up the MediaWiki software into smaller, reusable libraries which can be developed more easily and integrated into any PHP application. (…)

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This open badge acknowledges the skills of students and teachers using Wikipedia. Pilot badge by Sara Mörtsell, freely licensed under CC BY-SA 3.0.

New badges recognize Swedish students and teachers who contribute to Wikipedia

Open badges acknowledge the skills and contributions of students and teachers using Wikipedia, in a new education program led by Wikimedia Sverige. Editing Wikipedia counts as learning! (…)

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Sailors from the US Navy join forces with other volunteers to help Habitat for Humanity build homes for families who lost their houses in the 2003 Southern California Wildfires.US Navy Photo by Johansen Laurel. Public domain.

Civility, Wikipedia, and the conversation on Gamergate

The debates on Wikipedia about the Gamergate controversy have been heated. The Wikimedia Foundation believes inclusion and diversity are essential to achieving the mission of free knowledge, and that civil discourse is key to making that happen. (…)

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