It is already known through e-books, articles etc. that from the pool of article submission sites only some are good and the others aren’t good. And at exact moment of time, you may not get its meaning and scientific fact lying behind. Amongst various article submission sites only few sites have greater number of visitors thereby giving you more exposure and also your article may stand a chance to be picked up by renowned editors. But this reasoning is far from sufficient. There are also chances that some of the features may not be highlighted and you really need to have a proper knowledge about how internet works. (Referring this article may also help you to avoid bad sites and choose good sites.)