The decision to utilise a sub-domain, sub-directory or even a microsite is simply an architectural decision, but one that is often compounded with a marketing decision. In general, sub-directories are used to describe what individual pages are about while sub-domains and microsites are used to describe what an entire site is about. Read more – ‘When to use Sub-domains versus Sub-directories and Microsites’.
Carpe diem on any duplicate content worries: Google, Yahoo and Microsoft now support a format that allows you to publicly specify your preferred version of a URL. If your site has identical or vastly similar content that’s accessible through multiple URLs, this format provides you with more control over the URL returned in search results. It also helps to make sure that properties such as link popularity are consolidated to your preferred version. Read more – ‘Canonical URLs – What Are They All About?’.
A web community is a web site (or group of web sites) that is a virtual community. Web communities in recent times commonly take the form of a social network service, such as Facebook, Upcoming and Last.fm, an Internet forum, a group of blogs such as WordPress.com and Blogger, or another kind of social software web application. Read more – ‘The Four C's of Community’.