In reply to peat:
> I would like to make the suggestion to put a "like" button for comments on picture.
Better than a "Like button" is the option to make a comment about a comment.
So, rather than just click a button, you have to actually articulate why you like a comment
This means that it is for people who a) are intelligent enough to think through the lack of a "like button" and b) are prepared to spend more than a second or so to express their appreciation, and thus you have to c) really mean it, rather than it just being some trivial inconsequential instantaneous reaction.
NB No offence intended, this is a general comment.
"Like buttons", to me, tend to trivialise things, and are also anonymous, so could be used to anonymously bully, or insult someone, depending upon the content of the comment they are "liking".