  Twitter has started to share an impression_count variable as part of the
available public metrics for every Tweet collected with Twitter's APIs. With
the information about how often a particular Tweet has been shown to Twitter
users at the time of data collection, we can learn important insights about the
dissemination process of a Tweet by measuring its impression count repeatedly
over time. With our preliminary analysis, we can show that on average the peak
of impressions per second is 72 seconds after a Tweet was sent and that after
24 hours, no relevant number of impressions can be observed for ~95% of all
Tweets. Finally, we estimate that the median half-life of a Tweet, i.e. the
time it takes before half of all impressions are created, is about 80 minutes.
