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On Shedweb, they have a heart/broken heart (like/dislike) beneath each individual post. Seems a better idea to me, though I've never actually used them. Probably the software that VV uses doesn't allow it.
I completely agree with Wonky and want to place my on record thanks, but there does not seem much point in liking the comment as she now has 65K of them, and mine would be a drop in the ocean!
I'm not sure she can get any more to be fair. I think the system has maxed out.