There is no proper search function and no way to keep your place when you're scrolling. Want to quick switch to another app to check on something and come back to your Tumblr app two seconds later? Too bad, Tumblr has refreshed and you've lost your place in the scroll, you'll never get back to that post you were reading ever again. (And the same thing happens if you dare to reblog a post.) It's incredibly annoying.