1. A computer implemented method for interacting with components across different domains in a single user interface in an online social network, the method comprising: providing, by a computing device, data to generate a user interface with a first component and a second component, wherein the first component exposes content from a first database system at a first network domain, and the second component exposes content from a second database system at a second network domain; receiving, at the computing device, a first interaction with the first component; providing a reference in the second component in the user interface, wherein the reference includes information related to the first interaction with the first component; and receiving, at the computing device, a second interaction associated with the second component regarding the reference.