Here's the idea- how about the same buttons that appear under the posts (share, like...) also appear above it? It's sure would be useful for when I'm browsing my feeds at work (or other place, where my browsing time is limitted), I see something that interests me, and would like to like it for later (so I could return to it when I have the time). As for now it requires a massive amount of scrolling if the post happens to be a long one.