I'm pretty sure you can do this with graph analysis without needing sentiment analysis. I don't have the source to hand anymore but Facebook started doing a lo

I'm pretty sure you can do this with graph analysis without needing sentiment analysis. I don't have the source to hand anymore but Facebook started doing a lot of research into the different types of 'likes' may have applied. Did you like it because it was your friend without reading it? Did you read it but not like it? Did you read it and like it? These are all data points they track. If you assume they have accurate gauges of what you do and don't like, it's then easy to work out whether a post is going to sit well with you based on who did and didn't like it and what you've liked in the past.