I'm not an attorney, but via http://www.iusmentis.com/trademarks/crashcourse/rights/ it says 'The most common type of trademark infringement probably occurs when somebody else sells a product or service under a name that in some way resembles a registered trademark, and the products in question are the same or similar to the registered products.'

Zynga's classes are IC 041. US 100 101 107. and IC 009. US 021 023 026 036 038.

I don't see dating services in there: http://tess2.uspto.gov/netacgi/nph-brs?sect2=THESOFF&sec...

I'm no attorney, but I'd go talk to one about your classification.

And if you take Paul's advice, make sure you make part of the deal that Zynga will do forwarding of the old domain for you for 2 years so you can transition your 75K users over. Impact to them and your business is non-trivial.

I wasn't aware of that, from the article I assumed they had this covered.

> In addition you are so completely wrong about the communitys feelings towards Zynga (and you presume malice wrt. Cupid) that my guess is you have a personal bias in this game. Is that correct?

I wasn't suggesting the HN community was pro-Zynga, but I can see how that came across. What I intended to convey was that Zynga was clearly right, which is why a fight wouldn't garner sympathy. Though from the other comments it seems I'm wrong about that.

I do have a slight bias: jmtame and I are both YC founders. I felt very hesitant about posting my original comment, and went to great effort to make it neutral and focus on advice. I have no feelings towards Zynga at all, and no connection to them apart from having played Draw Something a little before it got acquired.