The Chairperson of the Referendum Commission has said it is using social media to reach as many people as possible in the run-up to next month's referendums.

The referendums on abolishing the Seanad and the establishment of a Court of Appeal will take place on Friday 4 October.

Speaking on RTÉ's Morning Ireland, Ms Justice Elizabeth Dunne said information is being disseminated using both Facebook and Twitter.

Around two million information guides are being sent to homes.

In the first of three information sessions ahead of the votes, Ms Justice Dunne said the Referendum Commission has written to the Houses of the Oireachtas Commission asking for information on the cost of the Seanad to be uploaded on to its website once again.

She said the Referendum Commission could not vouch for the figures of the Seanad.

Ms Justice Dunne said there had been information on the Houses of the Oireachtas Commission website until recently.

She said both questions being posed to the people in relation to the abolition of the Seanad and the establishment of the Court of Appeal were straightforward.

Ms Justice Dunne said the position in relation to the establishment of a Court of Appeal was that most appeals would stop with the Court of Appeal.

Only those matters of general public importance and in the interests of justice would be referred to the Supreme Court.

Those who wish to vote, but who are unregistered, have until close of business tomorrow to ensure they are on the electoral register.

Ms Justice Dunne warned that those who are unregistered are in the 11th hour, but there was still time.

She said people needed to take steps immediately and she would encourage those in doubt to check if they are eligible.

Ms Justice Dunne will return to Morning Ireland twice before the referendums to take questions from the public.