Could we have a "Like" button please

I know we have the facility to add to a Users reputation but, to me at least, it appears limiting in its use. ie, if I have already added to a users reputation, it does not allow another "add" even though what I would want to comment on is a totally new topic.

At present, it seems that that the only way to make a post thanking a person.

I may not be that grateful but a quick way of saying "Thanks" with a button would make a welcome difference.