WordPress.com Firehose is a paid service. For free public demonstration, unauthenticated connections are limited to one event every five seconds.
/firehose.xml /gusher.xml /firehose.org.xml /gusher.org.xml /likes.json /posts.json /comments.json /posts.custom.json /posts.org.json /comments.org.json /comments.id.json /likes.id.json