The web is huge, of course, but that's not a real problem. The problem is that time and space have a different meaning on the web.
Time is different too.
There are in fact micro-communities, working along similar paths, that ignore reciprocally their existence for an inexplicable long time. This has of course to do with both the vastity of the web and the fact that people do not know how to search. Furthermore, the web is truly international, in a depth that even those that have travelled a lot mostly underestimate. Some of the readers interacting with you may have problems, ideals and aims so 'alien' from your point of view that you cannot even hope to understand them. How many there really are is anybody guess.