Update

Recently noticed that we can now 'like' comments too, im guessing most people know this before me though. Anyway, this was one of the things that should have been there the same time 'like' was first introduced. I've seen pretty good/funny comments before but never got the chance to 'like' it, not that it actually matters much to me now. It helps to be able to see how many people 'like' something, for example when people share ideas in a group, it'll be like a vote.
Liking is a really popular thing, i see it on my news feed every 5-15 mins i think.

Also, by having the mouse over a profile or page link, there is this pop-out that show some basic information like mutual friends or how many people like this, and there's also a link to send messages to friends. This improves efficiency a little, since i usually have to click on the link to find out more, with this i can check things out faster without having to open so many pages.