Birds of a feather flock together, and sometimes that flock can do some great things. Talent communities bring together a wide variety of different artists in hopes that they can at least hang out together and discuss topics of interest to the community. While that is usually celebrities and pop culture, this allows them to discuss various aspects of art and even educate the next generation of talent.
Sometimes this can lead to collaborations, where people pool their talents and create something bigger than any of the individuals can do on their own. This can mean anything from a mural to some sort of video production, but there are virtually no limits as to what they can do as one. This can not only make the community a source of information but of inspiration as well, spurring the community on to greater things.