Social media such as Twitter has become an important communication tool for scientists. Twitter is a social networking service on which users post short messages called tweet, interact with each other by sending a reply and share other users' tweets by retweet. Scientists are using hashtags such as #chemtwitter and #ScienceTwitter to create communities on Twitter for networking and information exchange . Twitter activities about a research paper are considered to be one of the altmetrics , which is an alternative to citation counting for measuring scientific impact. Some studies reported that the number of tweets on a research article is positively correlated to the article citations . Attracting attention on Twitter is getting more important to promote scientific works.