How do they know you're not a flake?

Before your link gets clicked or your proposal gets read, a busy person is going to triage it to find out if it's even worth glancing at. Since everyone is now connected, the new permeability has created a deluge of noise, and just about everyone worth contacting is taking defensive measures.

Do I know this person?

Did someone I trust send them over?

Where does she work? (Ideo? the FDA? The New York Times?)

Has she won an award? Is she famous?

Are there typos and is the design sloppy?

Are they pestering me?

Do I already follow this person online?

Does music play when I visit the website?

Will my boss be pleased when I bring this project up?

Who else is pointing to/referencing/working with this person?

Is it too good to be true?

Notice that all of these questions get asked before the idea is even analyzed. Doesn't matter that this might not be fair, it's a hurdle you have to cross.

Not all good ideas are pre-proven, sophisticated and from reliable sources. That's not your fault. Doesn't matter. In a noisy world filled with choices, you can't blame your prospects for ignoring you. I know that you're talented and have a lot to offer, but do they?