If the Image is being created dynamically there won't be anything for browser to peek ahead at.

Edit: I'd be more worried about repeated calls - but presumably the service being called is idempotent.

It's more the side effect of upvoting the whole thread that makes me wonder.

https://stackoverflow.com/questions/705782/why-shouldnt-data...

This would indeed be problematic :-) The up/down vote buttons are plain anchor elements.