You'd have to capture the action with a browser extension - it doesn't look like "who upvoted what" is exposed at all: http://data.stackexchange.com/stackoverfl

You'd have to capture the action with a browser extension - it doesn't look like "who upvoted what" is exposed at all: http://data.stackexchange.com/stackoverflow/query/new http://data.stackexchange.com/stackoverflow/query/new