Confused whether to continue MVC or go for HMVC?
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I am developing a social media site, something like twitter which displays user feeds on it. My site is still in the first phase of development. I am using codeigniter MVC framework for coding. I recently learned that codeigniter supports HMVC framework and its useful to create large scalable applications. I am new to the concept of HMVC and don't know much about it. My question is whether I should convert my code structure into HMVC or should I continue with MVC. I have got new features to be added later on after the first release of the site.
Currently I have completed with the registration and login part of the user. I have still left to code the entire application after the user logs in. 
Can anybody suggest me whether I should continue with MVC or go with HMVC and if so, what should I begin with?