I have a site with around 2000+ users. It's a very small niche! And this another site has opened up and all my users(who's email id's where in public) have got an invite from that other site. I am wondering if i can take action against the other site, can i do this??? Please suggest*frustrated*
You can't do anything but the users could cause the invites were not CAN-SPAM compliant because they never opted in to receive it.
Unless you want to get into some black hat things that I will not go into, there is nothing you can do in a legal regard. This is just online business, if there is a chance to steal users from a more popular site, it's going to be taken.