My friend Zoran operates a small website called "Los Angeles Street Photography"
http://losangelesstreetphoto.blogspot.com, on which any photographers are invited to submit their work.
In discussions that I've had with Zoran about the definition of 'street photography', he always comes back to that "it's basically about
life." Meaning: The life of humans, as opposed to other living things. That's about the simplest definition I can think of. In the case of this collection, it has the further requirement of having to be about life in a particular geographic area.
It is up to each photographer (or viewer) to make a definition of the genre. Some strongly prefer that the people depicted are not conscious of the camera, so as to documented without the photographer influencing their behavior. Others will only photograph people that have been spoken to or 'chatted up' by the photographer prior to the exposure being made.
All that matters, in the end, is that photographs are created that are worth looking at.
And
that is going to vary with the viewer's own preferences.