On Mac, the voting up/down control is invisible until one hovers over the space between the vote count and the person's avatar. Might get more voting if the control was visible. Same result under three browsers:
- Seamonkey: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0 SeaMonkey/2.46
- Firefox: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:51.0) Gecko/20100101 Firefox/51.0
- Safari: Version 10.0.3 (11602.4.8.0.1) - they don't make it easy to get the user agent...