Tech writer Garnett Murray:
When I browse the Tumblr Dashboard I feel overwhelmed by the amount of great content—as most people probably do—and it’s very hard to focus on longer entries people post. I still use an RSS reader for those kind of blogs, but I have a feeling most Tumblr users do not. So I often feel my longer posts get easily lost in followers’ Dashboards. That’s not a problem with Tumblr, it’s just the way people digest content here.
This is exactly the reason I’ve stopped blogging on Tumblr and consolidated everything under WordPress. Tumblr is awesome, but I just wasn’t posting the quick bites of media content that flow so well there.