Hi,
I have developed in the past several opinion mining on tweets, you can see one of them on my freelancer.com profile page.
Myself Ph.D. in advanced analytics having 12+ years of experience in developing and delivering analytical projects using open source R (including in-memory computing), and can deliver your requirement with R, accompanied by a step-by-step word document, what each line or code means.
As, freelancer.com bid does not allow for attaching; cannot display my expertise in this area. I am available at freelance chat (click on my name and options), to understand the requirements and explain my approach if required in detail.
Waiting for your reply (or) initiation for chat discussion.
Regards,
Dr. Kumar PM.