Integrate the likes/comments for activity

[sairamc]

It would be nice to have the comments and likes included in this project. Also if there is a way to calculate the number of people who liked it and number of people who commented as metadata that would be slick.

[christospappas]

definitely would like to do this... it'll require a restructure of the code/schema. I'm a little busy with work at the moment but will try get to this soon.