Hi Pratyasha,
Have you checked the rapid data load package for loading data into yMKT? it has social data scope item that help you load from twitter, facebook, google+ and klout. Also, the email load scope item enables you to load excel/csv data as social media data.
For more info: https://service.sap.com/rds-dlh
data load blog: http://scn.sap.com/docs/DOC-61065
once the data is in the social tables the reports SMI_SENTIMENT_ASSIGNMENT CUAN_IC_MASTERDATA_EXTR_FULL Have to be run. p>