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This depends on the specific dating platform and what you feel you are trusting them with. Some are genuine while others are full of fake accounts and purchased profiles. You should read the privacy statement of a site to see if they will look after your private information. I recommend you stick to established known dating platforms such as match.com, zoosk.com, ultracupid.com and pof.com. A profile on each of those sites should be enough to help you find somebody and they are all trustworthy. If you are into the photo swipe systems then tinder and bumble are also good.