One social skill that we can ALL practice to make more friends! The trick here.. is to start thinking about OTHER people and their wellbeing instead of our own.. i noticed that when I care too much about what I think and how I feel... i am less effective socailly. Anxiety, worry, self hate, all these thoughts processes are selfish and self involved. However if I turn them around and focus on helping others, giving other people smiles and good feelings, making other people feel comfortable and liked.. then my social status goes WAY up and people like me much more. 
Hope this helps some people :)