The free communication of thoughts and opinions is one of the invaluable rights of man. The press shall be free to every citizen who undertakes to examine the official conduct of persons acting in a public capacity; and any citizen may freely speak, write and print on any subject, being responsible for the abuse of that liberty. In prosecutions for publications, investigating the proceedings of officers, or where the matter published is proper for public information, the truth thereof may be given in evidence; and in all indictments for libels the jury may determine the facts and the law, as in other cases.