I prefer the personal touch of writing a comment. I am on Facebook and have never once used the "like" button. Just not very personal to me.
If someone posts a photo I like, I write a quick comment. I may even write "agree" on the comment line but I just can't bring myself to use the "like" button.
When I go through Facebook I do tend to comment on a lot of things but sometimes its just a word or two, sometimes I write a paragraph.
I don't think I would like to have "like" button here.
It means so much to me when people take a second to write something on the comment line - even if it is just one or two words.