Users of Google’s (GOOG) various free services were again reminded to watch their backs recently as the company announced it would shutter the world’s most popular RSS reader, Google Reader. While any Google service could theoretically be shuttered at any time, fans of homemade videos can likely rest easy for the time being, because it has become increasingly obvious that YouTube is one of the better investments Google made in recent years: the company announced late Wednesday that YouTube has now surpassed 1 billion monthly users. The News comes just 10 months after YouTube topped 800 million monthly viewers last May.