One can hover over twitter's list of retweeters mentally adding their hundreds or thousands of followers to your own reach. But are they hearing you? Probably not.
summary
The Trouble With Retweeting.
Chinese researchers report doing so reduces our comprehension of the very post we’re sharing.
By Tom Jacobs. post 
Students who re-posted information on a microblogging site were less able to accurately describe the content of those messages compared to those who simply read them and moved on.
Troublingly, this reduced level of comprehension was also found in a separate, off-line reading assignment conducted immediately thereafter.
research
Does micro-blogging make us “shallow”? Sharing information online interferes with information comprehension. By Tonglin Jianga, et al. pay
We conducted two experiments to investigate the effect of Weibo's structural features, namely, irrelevant information interference and feedback, on information comprehension.
We found that participants' online information comprehension was negatively affected after browsing (reposting and passing) Weibo messages through the feedback function, and that this negative effect further extended to an offline reading task.
Furthermore, meditation analysis showed that cognitive overload mediated the negative effect of reposting on information comprehension.
The findings provide important insights into the influence of Internet technology on reading and learning.
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Journaling, as I have done here, may be the antidote. The sentence selection demands a second read with more critical attention.