Is there any free dating site with the 'technical chops' to reign in spam? So far as I can tell, none of them overcome spam directly via technology.
eHarmony - Subscription
Match.com - Subscription
Myspace - Gets spam; though it's less of an issue because it seems like spammers haven't been able to figure out how to emulate a typical real profile, and because many people use the site to connect with people they know already. In other words it's not technology or effort from Myspace, it's that the model is different.
Facebook - Pseudo-dating site, like myspace, plus it has additional restrictions on creating an account.
Any other dating site I've seen has spam all over the place.