For me, it would seem that anarchidt communities often exist around social centers, like infoshops, locally. This site and the anarchy planet, littke black cart, infoshop.org, Anarchy magazine, Fifth Estate, etc. would be ways of sharing a broader, English speaking community for anarchists while protests often serve as much of a connecting point as skills shares abd group dumpster diving for many anarchists. This social fabric need not include any of the above, but the are examples of share commonality among individuals, like sharing cultural values. Without a shared interest there is no community and without functioning ways to interact socially, there is no visibility.
Yes an anarchist community is not special necessarily, but all calls for community are an attempt to bring more social connection. The social fabric of a community is woven by the many lines of interest share by an identity of people, with gatherings being the primary way of building a community.