After child pornography was found on Tumblr in November and subsequently pulled from the App Store, the microblogging and social networking site, owned by Verizon Media, was forced to make a big decision. Starting December 17, Tumblr banned all pornographic and adult content from its site. As figures from SimilarWeb show, this move caused a massive fall in traffic, going from 521 million in December to just 370 in February.Tumblr claims it had been considering such a ban for a while and, in response to traffic figures, a Tumblr spokesperson reportedly said: "We made a strategic decision for the business that better positions it for long-term growth among more types of users. This was the right decision." Only time will tell if this decision bears the fruit that was hoped for.