[Kalium]

Users would quickly adapt. Something simple like spinning syntax would address that. I agree, OKCupid could be more clever, and build systems much harder to get around.

That said, I don't think the incentive is there for them to do it. Even if they removed 100% of all spammy behavior, I don't think it would solve the problem of message volume. If we assume that skimming a profile and writing a personalized message takes five minutes, a "genuine man" user is able to churn out a dozen messages an hour. Women would get less than the hundreds of messages they get today, but still far too many to work with.

From what I've seen, there's a basic contradiction at the heart of online dating. In general, women only want to be contacted by men who they are attracted to and interested in. Also in general, men live in fear of being ruled out and missing their chance with a woman they find interesting.

No spam filter can help you there.