This includes being able to search for tumblrs. Or finding out just what is possible with a tumblr account, as unlike Livejournal the help doesn't tell you. This assumes one can actually find where the help is as it's not linked to from the homepage. Seriously, my first impressions of the site are of it being a modern-looking but feature-lacking version of LiveJournal.
Anyway, "Torkell" was taken, so I've used the highly imaginative name "Torkellr".