Bug #605137 comment #2 is SPAM

It appears that Ayan George (https://launchpad.net/~ayan)--who is a legitimate user of Launchpad and a Canonical, Ltd. developer--is a victim of account hijacking. The following 13 additional spam comments (and possibly others that I have not found or which have made since I checked) have been posted from his account:

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/543854/comments/3
https://bugs.launchpad.net/ubuntu/+source/libpam-mount/+bug/574329/comments/22
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/589850/comments/9
https://bugs.launchpad.net/ubuntu/+source/pidgin-libnotify/+bug/589890/comments/11
https://bugs.launchpad.net/ubuntu/+source/gnome-panel/+bug/589899/comments/8
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/597247/comments/2
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/598645/comments/11
https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/601639/comments/2
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/601640/comments/4
https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/603903/comments/2
https://bugs.launchpad.net/ubuntu/+source/syslog-summary/+bug/605145/comments/1
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/608984/comments/1
https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/608996/comments/3

I've hidden all these comments.

Looks like unlucky use of a forged sender address on email.

See also https://answers.launchpad.net/launchpad/+question/154642

Thanks Max Bowsher, that solved my question.