I have posted this on another similar post:
This is for free not upgrade people. The issue with the double 'like' that becomes a match is that you don't see 'clearly' who likes you (not for free anyway), while you can try to find it if the person is online with the blurry photo and the first and last letters of their name it is at beast a 505 chance. So you have to rely on your own search to find profile you like independently of what others are doing and send a 'like' they also can try to find you with the blurry picture and letters but it seems they made it a very honest site which is to do search or who's on line search, look at profiles and hope someone likes you then you will have a 'match' and free messaging is unlimited with that person. I hope I made it clear. The coins thing is for about one message/day (it takes 15coins to contact a person that would not have been already liked you). So if you see someone you want to message, first send a 'like' and if that person has already 'like' you, you will receive a message from Mingle saying more or less that you are now match and can message that person. If you don't receive that message from Mingle you can use some of your 20free coins. If you come every day (24hrs) I think you get another 20coins free, I used mine yesterday so I was left with 5 coins so today I'm up to 25.

This is new: I can see it will make more difficult for legitimate people from other country to contact people in the USA, Canada and western Europe. Sure it will stop some of the scammer, but I think we were smart enough to recognize those on our own. Most people start by looking as close to home as possible and the algorithm is build to do that base on your location. Anyway like Robin wrote, people will figure it out and will see where it goes.

Thanks Robin, I did rambled a lot, I still hope many people will understand it. The approach will still have some negative impact. If you just want to send a compliment or being friend, your possibility will now be very limited and nil when you reach that 2000 free coins.

This is for free not upgrade people. The issue with the double 'like' that becomes a match is that you don't see 'clearly' who likes you (not for free anyway), while you can try to find it if the person is online with the blurry photo and the first and last letters of their name it is at beast a 505 chance. So you have to rely on your own search to find profile you like independently of what others are doing and send a 'like' they also can try to find you with the blurry picture and letters but it seems they made it a very honest site which is to do search or who's on line search, look at profiles and hope someone likes you then you will have a 'match' and free messaging is unlimited with that person. I hope I made it clear. The coins thing is for about one message/day (it takes 15coins to contact a person that would not have been already liked you). So if you see someone you want to message, first send a 'like' and if that person has already 'like' you, you will receive a message from Mingle saying more or less that you are now match and can message that person. If you don't receive that message from Mingle you can use some of your 20free coins. If you come every day (24hrs) I think you get another 20coins free, I used mine yesterday so I was left with 5 coins so today I'm up to 25.