Missing a question - Did something like Facebook exist to take inspiration from? If so - Yes, and I am - not for the general public but for a small niche, and

Missing a question - Did something like Facebook exist to take inspiration from? If so - Yes, and I am - not for the general public but for a small niche, and not an exact replica. The idea of groups and walls comes from FB, but nothing more. In fact, inspiration comes from Twitter, FB and G+ combined. And I'm doing it with AngularJS, firebase.com, cloudinary.com and some AWS services such as Elastic Transcoder and S3.