As I was unable to find an english source that stated exactly as much as Hurriyet.com did (even HDN), I decided to translate it myself.
Access to Wikipedia, the biggest internet encyclopedia was blocked in Turkey. Following the block, social media mixed up. Wikipedia, the encyclopedia that everyone can contribute to has not been accessible in any languages starting at 8AM Turkey Time (UTC+3). When checked through e-devlet portal [turkey's online govt portal with tons of tools to check stuff like tax info etc], the tool says "There is no court order found that is ordering the blockage of the site.".
When checked from BTK's [Information and Communication Technologies Authority] website, it is revealed that there's no court order but there is indeed an "executive precaution" applied on the page, with the following statement: [English part is on latter half] “5651 sayılı Kanun uyarınca yapılan teknik inceleme ve hukuki değerlendirme sonucunda bu İnternet sitesi (wikipedia.org) hakkındaki Bilgi Teknolojileri ve İletişim Kurumu 'nın 29/04/2017 tarih ve 490.05.01.2017.-182198 sayılı kararına istinaden Bilgi Teknolojileri ve İletişim Kurumu tarafından İDARİ TEDBİR uygulanmaktadır. (After technical analysis and legal consideration based on the Law Nr. 5651, ADMINISTRATION MEASURE has been taken for this website (wikipedia.org) according to Decision Nr. 490.05.01.2017.-182198 dated 29/04/2017 implemented by Information and Communication Technologies Authority.)”
THE REASON WAS UNCOVERED
From what we've learned, there have been some negotiations with Wikipedia for some while. There has been claims saying that Wikipedia [WMF?] didn't reply to warnings about the articles that supported terrorism and/or showed Turkey as having relations with Terrorists. They, instead of removing the posts, protected said articles.
[Sidenote, I've seen some stuff on HN suggesting not just that this claim may be true, but that the content that was asked to be removed was indeed showing the reality. link]
WHAT WE ARE ASKING FOR
For a long time, Turkey has been negotiating more with social media companies and presses of the internet and asking them to open up agencies, act according to international laws and follow court orders.
According to the statement by authorities, the site will be reopened if they follow the requests of Turkey and court orders and edit the content according to that.
[There was random social media trends stuff here that I omitted, and yeah, this is the whole article]