A troll recently said:
: In the meantime the nearly impossible, change that, the impossible task of making legitimate definitions of Socialist rigamarole like 'surplus value' and 'alienation' has apparently fallen on your shoulders
SDF: Surplus value is explained rather simply. Supposing I grow my own food. If I grow food on a farm to feed myself, and if I grow more than enough food to survive upon, then the extra food I grow beyond that necessary for survival is the surplus value of my farm. Surplus value can be calculated socially by adding up everyone's contribution and then subtracting the contributions that were strictly necessary for brute survival.
Alienation is when you sell your labor-time to someone else, as I explained here.
These ARE the legitimate definitions. Trolls, on the other hand, are not legitimate debaters.