Usually how I do it is each person I add to my friends list gets one favor from me on the house then if they do a favor for me i write it down and make sure to do something for them at sometime in the future like if they are hosting/djing I drop what I'm doing and show up for their event at the club some people I would use to give giftcards too i only have a few friends that will come hang out with me any time to try something new to them I'm doing for fun