I thought Facebook was already all about stalking. :p
Wouldn't it be just easier to get a feed on any changes to a person's status? That seems more "stalky" 'cause so many people update their status on every little thing they do.
Hmmm.. I'm of the opinion that if you going to put your relationship details openly on Facebook you reap what you sow.
Yes it's a little weird that to keep tag on if your potential partners love life but it's not really violating anyone's privacy.