I registered on the site several months ago. There is no cost to send messages to the other profiles. I have noticed that when I get a message or flirt from a profile, it usually is deleted within one day. The site administrators seem to be taking down many profiles that are considered fakes. Note that when the profile is removed, all communications with that profile are also deleted from your inbox. The site has suspended nearly all of the profiles that write messages to me. Many free dating sites are magnets for spammers and fake profiles.
I also noticed that if you did not sign into your account after a period of time, my login information is not accepted. A few times, I requested for a password reset, but even after receiving the new password email, I would still have problems logging into the site.