A bench of Chief Justice D N Patel and Justice Jyoti Singh listed the matter for October 11 while extending the time to file replies to the June 4 and 8 notices issued by CCI to WhatsApp and Facebook, till then.
While CCI was represented through Additional Solicitor General Aman Lekhi, WhatsApp and Facebook were represented through senior advocates Harish Salve and Mukul Rohatgi respectively.
WhatsApp and Facebook have also challenged the CCI's asking them to furnish certain information for the purpose of inquiry conducted by it.
The division bench of the high court had on May 6 issued notices on the appeals and asked the Centre to respond to it.
The court had said it saw no merit in the petitions of Facebook and WhatsApp to interdict the investigation directed by the CCI.
The CCI had contended before the single judge that it was not examining the alleged violation of individuals' privacy which was being looked into by the Supreme Court.