Pronounced jiāng shī fěn, it means zombie follower. Also known as "spam fans," these are fake followers of a microblogger. They usually set up multiple accounts to follow a certain blogger and are paid to enhance the "popularity" of that particular microblog site.
Let's put it into context:
Phil: Hey, Allen! Do you have a Weibo (a popular microblogging site) account?
Allen: No, I don't have a Weibo, Twitter, or Facebook account.
Phil: Come on! You're missing all the fun on those sites!
Allen: You've got a Weibo account? How many fans do you have?
Phil: Just a little bit over 1,000.
Allen: Wow, I didn't know you were that popular!
Phil: Yeah! Everybody loves me, except the 900 jiāng shī fěn (zombie followers) in there…
Allen: …
