Another wave of online communities is underway. The first wave, beginning with the Well, took advantage of the social adoption of email to build community upon Usenet, bulletin boards and forums. A basis of trust in email-style interfaces and conventions enabled pooled discussion. This wave takes advantage of the social adoption of the web to build community upon web-native tools. Because the web is a more diverse environment, so too are the tools. The physical and logical infrastructure of the web has reached a maturity while usage has surpassed a tipping point where it is ingrained in most people's lives. As people have become participants on the web, they are building a new social infrastructure, connection by connection.