Attention coffee house owners: Here are the 5 social networks I believe you should join, or at the very least observe. #1: Twitter Twitter is huge. Your customers are likely talking about you on Twitter and wish you were on Twitter. Millions of people are chatting about everything on Twitter. Try searching for the name of a coffee shop on their search site. #2: Yelp Yelp is fast becoming the #1 place for people to write their own reviews of restaurants, businesses, and also coffee shops. Guaranteed your favorite coffee shop is listed and probably reviewed. #3: Flickr Flickr is one of the oldest and most popular photo sharing sites on the Internet. I personally upload a bunch of photos of Arizona coffee houses. #4: Facebook Every coffee house should have a Fan Page on Facebook where people can become a fan. #5: Brightkite Brightkite isn’t as popular, but lots of people are “checking in” at coffee shops and posting photos from their cell phones. What social networks have I missed? Are you already connected? Share a link to your profile in the comments.