This subreddit has an embargo on current events that makes this question difficult to answer, but there have been a number of threads about the split between Sunni or Shia.

This post has been removed. As noted by the other respondent, current events are off limits here per this subreddit rule:

To discourage off-topic discussions of current events, questions, answers and all other comments must be confined to events that happened 20 years ago or more (1994 or older).