So, you could broadcast your ideas to an uninterested audience, or you can hone in on the listeners who are looking for what you have to offer. Think about your offering and how you present that offering... This will impact the size of your following and how they react to you. Everyone has a different personality and list of things that pique his or her interest. Some interests are more popular than others, and some personalities are more magnetic than others. Also, think about what your main goal is when you are interacting with others. If your intent is to sell something to someone and your end goal is to get them to buy something, you will interact with them very differently than if your intent is to find out what is bothering that person and what you can do to help solve his or her problems.
You may be wondering why nobody is talking to you, and it may be because you're talking to the wrong audience or because you aren't saying something that interests your audience. Realize that the same way that you can attract more people to talk to you is how you can begin to properly set yourself up online. By identifying what your niche is and who you want to interact with, you can create the best opportunities and showcase your offering in a way that is different from everyone else -- and you can work on engaging with the right audience in the right way.
Stay tuned for more specific ways to make a splash, and soon you'll be asking, "Why do so many people want to talk to me?!"