For many new bloggers, we sort of bypassed the era when forums, groups and message boards were the primary way that people started discussions online. Much of our chatter now happens on Twitter, but forum-type platforms are still a great way to communicate with like-minded people (we have our own, here). Even with social media, forums are becoming and increasingly powerful way to find honest, organic conversations that outlive the lifespan of a twitter feed.
So what's a Google+ Community? It's not a blog, and it's not a profile page – it's a place where like-minded people can gather and post links and content and discuss relevant topics. You can set up a community, and within it, sub-topics that address different things. For example, if you start a “Personal Style Blogging in Michigan” Community, you could have sub-topics where other bloggers could share their posts, a sub-topic for events, one for inspirations, etc. (This concept is most similar to sharing things within your Google+ circles, but on a broader scale.)
Why should bloggers care?
We think this is a pretty freshly inovative step for Google+, one that may bring new and more engaged users to the platform. For bloggers, it could be an easy and smart way to find blogging peers – whether they're local to you or just interested in similar topics and hobbies.
TechCrunch mentions that users will have options when setting up Communities; you'll be able to make them “public, public with membership required to interact, private but discoverable, and private but not discoverable or indexed.”