I always thought one of the advantages of Tumblr over Twitter was that Tumblr has a relatively low quotient of metatumblr content, while Twitter is heavily larded with metatwitter.
The ability to see who you rank just ahead of and just behind is a privacy fail - another way Tumblr is superior to Twitter is that your number of followers (and other metrics, like “likes”) is hidden, well, now someone adjacent to me can decide to post their activity page.
How about a really useful feature, like a “bacon filter” that removes topics you don’t want to see - e.g., all posts about Tumblarity, or food porn, cats (bonus if it can recognize images!), or Julia Allison, etc., or all followups to a particular post. Even primitive text-based Usenet in the late ’80s allowed you to hit “k” to kill a thread.
