My favorite social media moments are when brands or companies have engaged with me. I tweeted about their brand or company, and they tweeted something back. How cool is that?
If you love someone's app, food, service -- tell them about it. It will make them smile. And you will smile when they engage with you in return.
If you have a brand, company, interest -- it's your turn to do the same for others. If they say they love your Downtown/food/business/blog. Tell them "Thank you."
Or if you are super awesome, you could try to order them a pizza:
http://blog.haikudeck.com/customer-support-haiku-deck-style/