Tumblr is a microblogging and social networking website that lets users make a blog and put whatever they want on it. 40% of children between 12 and 16 years of age interviewed in a Bitdefender study (Teens and online Threats) said they use Tumblr. Tumblr has been criticized for a very permissive attitude towards adult-orientated content. In November 2018, Tumblr was removed from Apples iOS App Store over a child pornography incident. The company officially banned adult content, hate speech, violent content and other forms of harmful and unlawful content.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/parents-know-tumblr/