When do you know if advice and help has strings attached.

[Antonio Aguilar]

I'm new to Real Estate investing and am new to the site as well. I've received some responses here from people who begin to guide in direction of their business. When do you know that people are reaching out to offer advice and support and when do you begin to suspect that they are serving their own self interest? Have many of you run into 'blogger trolls'? 

Thanks