Large online communities have mass appeal but may not satisfy niche interests, while smaller niche networks are more vulnerable. When building a community, consider global interest in the topic, how engaged people will be, and whether initial interest needs growing. Offline cues like body language are lacking online, so capitalization, punctuation and emoticons convey tone. Online identity involves usernames and profiles rather than physical appearance. Providing opportunities for members to gain status through badges and roles helps build social capital. Active participation from moderators is key to hosting a successful community discussion.