There's a new PS4 update, and along with more sharing features, we have support for communities.
There's a lot of features missing, including a search function. So it's not the easiest thing to find specific communities. If you own a PS4 and would like to join in on the conversation, feel free to leave your PSN ID here, or PM it to me so that I could send you an invite for your convenience.
Once iM@S PS4 comes out, it will be the premier destination for sharing in game screenshots.
Also, you can suggest any changes in the community here, such as background images and Message of the Day. Provided more than one person agrees of course.