Need Quick Answer Please! Helium Ads...

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When you go to the About Me page on Helium, down the left side there are ltitle 'ads' for writing contests, how to publish, free writing help, etc. I was wondering if everything Helium shows is credible? Specifically I am asking about LongRidgeWritersGroup. They give you writing courses IF they accept you after submiting a writing test. If helium is advertising this on its site does that make it credible? Because the writing tests asks for an address and phone number, which I'm worried about giving out. All I want to know is if it is credible from Helium. Thanks!