Not to have a go at anyone here, but I'm a bit averse to the whole 'like/heart/favourite/vote-up' scenario you see everywhere these days. I think it's a little more worthwhile for the recipient to receive feedback in the form of a comment and not something that involved a solitary click of the mouse. Whilst the sentiment might be sincere, it's just not the same as receiving some nice words.
Yeah, this. I favourite stuff that I want to come back to later, and will give an actual comment on what I like about it. Just clicking 'like' is such a copout.