What are Scuba Diving communities?
Scuba Diving communites are online hangouts where you can find snorkel/scuba diving tips, reviews, reef maps, and photos. Like to scuba? Join one of these communities to hang out with other divers.
About Online Communities on Twitter
Twitter is an American microblogging and social networking service on which users post and interact with messages known as "tweets". Registered users can post, like and retweet tweets, but unregistered users can only read them. Twitter communities are centered around common hashtags that members of the community use in their tweets to reach a common audience.
Do you know one? Please submit it!