that I've been part of the development process for or conferences where I have a say in the execution. I would most definitely seek to enforce all the trademarks of Rails. The trademark of the logo was cancelled on October 25, 2019. Reception Scalability In earlier days, Rails running on Matz's Ruby Interpreter (the de facto reference interpreter for Ruby) had been criticized for issues with scalability. These critics often mentioned various Twitter outages in 2007 and 2008, which spurred Twitter's partial transition to Scala (which runs on the Java Virtual Machine) for their queueing system and other middleware. The user interface aspects of the site continued to run Ruby on Rails until 2011 when it was replaced due to concerns over performance. On the other hand, many Rails business application developers relied on system architecture design, including choices of database engine, cache configuration, and servers, to tackle scalability issues. The original author of Rails, David Heinemeier Hansson, criticized Twitter, saying that their problems scaling were the consequences of their own poor architectural decisions and not the fault of Rails. According to Hansson, blaming Rails for their troubles while making no contributions to the framework is ungrateful and unjust. In 2011, Gartner Research noted that despite criticisms and comparisons to Java, many high-profile consumer web firms are using Ruby on Rails to build scalable web applications. Some of the largest sites running Ruby on Rails include Airbnb, Cookpad, GitHub, GitLab, Scribd, Shopify, and Basecamp. As of January 2016, it is estimated that more than 1.2 million web sites are running Ruby on Rails. Security In March 2012, security researcher Egor Homakov discovered a mass assignment vulnerability that allowed certain Rails applications to be remotely exploited, and demonstrated it by non-maliciously hacking GitHub after his earlier attempts at responsible disclosure were dismissed. On September 24, 2013, a session cookie persistence security flaw was reported in Ruby on Rails. In a default configuration, the entire session hash is stored within a session cookie known as CookieStore, allowing any authenticated session possessing the session cookie to log in as the target user at any time in the future. As a workaround, administrators are advised to configure cookies to be stored on the server using mechanisms such as ActiveRecordStore. Researchers Daniel Jackson and Joseph Near developed a data debugger they called "Space" that can analyze the data access of a Rails program and determine