Netgen Push provides a simple and an effective way to push any kind of content from eZ Publish to various social networks.
For the time being, Twitter and Facebook connectors are implemented, while eZ Publish REST API and Tumblr API are in the planning stage.
Netgen Push also provides a basic framework to develop your own connectors to any social network that uses OAuth authentication protocol.
You can find detailed installation and usage instructions in the blog post about the extension.