“Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, OR of the press, or the right of the people to peaceably to assemble, and to petition the government for a redress of grievances.”
If nothing else, blogs ought to be considered petitions of grievance.
It is or should be obvious that the founders were referring to the freedom of expression whether by spoken or written word. Both methods were given equal protection. The Courts have confirmed the freedom of expression idea in cases involving art (or so called art) such as the infamous Piss Christ and in demonstrations involving flag burning and other acts of non verbal or non written expression. The efforts to enact a shield law for members of a given profession or employees of certain business is not very wise and actually has nothing to do with the first amendment.