Yahoo bought Tumblr for its rambunctious community. Despite the coat of paint rapidly applied to its email, homepage and various apps since Marissa Mayer arrived as chief executive less than a year ago, Yahoo was still in need of an injection of youth and energy.

But in solving that problem, Tumblr may have created another for Yahoo. Ad execs and Wall Street analysts alike are voicing concerns about – along with gifs and memes – one of Tumblr’s most popular types of content: pornography. Read more

Tech news from around the web:

Blogging service Tumblr is set to raise $75m-$100m in venture capital, The Wall Street Journal reports. The fundraising, which is said to include Facebook and Groupon investor Gerylock Capital, is expected to value the company at $800m. Read more