I tried www.dating.com while looking for a serious relationship, but found that it was more like a paid communication service than a platform for real dating. The "credit" system forces me to constantly buy opportunities — for each message, for the opportunity to read it or reply. Some of the users I communicated with were active, but I wasn't sure if they were real people. As a result, my enthusiasm waned a bit, although the service can be useful if you understand how it works.