A learning community is a group of people who are all connected by a common educational or developmental goal. It is an idea which is used in various educational settings as a way to increase motivation and ultimately to empower the learner in constructing their own meanings and methods in addressing the particular problem or issue they are currently working on. Attributes of a learning community typically include being collaborative, decentralised and distributed, much as, and for the same reasons that Communities of Practice (CoPs) are also applied, both in educational and business settings.
Wikipedia (along with all other Wikimedia projects) are potentially such learning communities. To illustrate: pick a page on Wikipedia, any page. Look at its history page - make sure it has been written by a number of contributors (some articles are still predominantly the work of a single individual!). Now take a look at its talk page. What do you find? Usually a mix of questions, points, criticisms; in other words, suggestions to improve the article from their perspective.
Here we have a group of people engaged in negotiating the meaning and scope of the article. Let's pick this sentence apart:
Obviously, what people are interested in Wikipedia is creating a satisfactory (if not excellent) end-product; what a learning community is about, however, is the process. But the two are inseparable; the product is created by the process - it is a collaborative encylopedia. Therefore, the work of Wikipedia(ns) is negotiating the process as much as creating the product (if not more so). What is crucial here is to remain self-critically aware of our discourse, which is how Wikipedia works but also how it breaks down in occasional circumstances.