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I've been using an app lately that let's you message random women and start a conversation. I need some good openers for messaging random women online. I've noticed the obvious "hey" or "hello" rarely works
The reason why the hey or hello rarely works is because there is no direction and sounds a little creepy. Hence, the best technique is to Can I ask for your opinion on something? This can be like anything that you feel you can talk a lot about. OR you can try Hey you look familiar, have we met before? This generally goes to strangers that you add on facebook.
Therefore, the best online opener will be an approach with purpose. Also, social media have information on the target that you wants to build interest on. You can view her albums or interests to see what type of person the target is but don't bring it out just pretend to be curious. (But behind your head, you have an idea of what she is interested in and studied about it) So, at this point, you can say that you have similar interest and just expand the conversation. When the time is right, that is your key to complimenting the target and maybe asking the target out.