I. Introduction
Twitter is one of the most popular microblogging platforms around the world[1]. Users can post text messages of up to 140 characters to tell others “what they are doing” or “what is happening”. User-generated short messages are called tweets. By following others, users can keep up with their latest posts. Tweets can contain URLs, embedded images/videos, user mentions, locations, and hashtags. We will focus on the hashtag adoption in this paper.