Tumblr used to be a lot more popular, but its collapse is usually attributed to them banning NSFW content. Not everyone was posting or viewing NSFW of course, b

Tumblr used to be a lot more popular, but its collapse is usually attributed to them banning NSFW content. Not everyone was posting or viewing NSFW of course, but there was enough overlap in audiences to cause a cascade which ended with nearly everyone, NSFW or not, moving to Twitter. It's a classic Yahoo acquisition fumble, they bought it for $1.1 billion and ended up selling it on to Automattic for just $3 million post-exodus.