Partly the social void via digital communication, and partly ancillary emotions generated by having something nice that makes my sisyphean pursuit just a little bit easier.
If I was able to live a life where I could see my friends and family, and be a part of a community, without any threat of that way of life being destroyed, I would not be working a job in a first world country.
Nor would I be stuffing my metaphorical and physical face with: entertainment, food, various media like video games, etc. Good company is enough to stay entertained for hours -- and it's free; but past a certain age becomes annoyingly more difficult to find as people get loaded on responsibilities, and time-commitments, and other things they believe are prudent for their "success."
I'm an extreme extrovert. My biggest gripe with capitalism is that it's alienated and killed the souls of all the people around me -- and now I have to spend copious amounts of money just to try and fill that void.