Royal Pingdom: “Over the past few months there has been plenty of speculation around the Web that Twitter’s growth has stalled, but if we look at activity on Twitter in terms of the number of tweets, this is far from the truth. According to our research, Twitter is as of December processing more than one billion tweets per month. January passed 1.2 billion, averaging almost 40 million tweets per day. This is significantly more than Twitter was processing just a few months ago.” [This posting includes a chart visualizing the growing use of Twitter.]