Several months ago, people were asking if Twitter’s growth had stalled thanks to several months of flat traffic.  But it appears those reports of Twitters “demise” were premature.  According to a recently released report from Pingdom, Twitter passed the one billion tweet mark in December.  The growth continued in January, with 1.2 billion tweets sent.  That averages out to over 40 million tweets per day.  Looks like Twitter continues to be the little engine that could.