FACT: No matter how powerful the Texas Legislature thinks it is.... the reality of the federal law trumps state acts. And the Federal courts have upheld the federal Communications Decency Act. For a better view of the Act itself, see
HERE
The discussion above is informative, CL getting knocked by the Attorneys General, and Backpage also pressured, but the Courts have already ruled. Essence of the ruling is that the underlying web presence (not the person doing the posting) is invulnerable.
So while the Lege might make it possible for a state or local prosecutor to chase the POSTER individually, the fact of the matter is the place hosting the post cannot be held liable for the post itself.
Won't stop some prosecutors from trying, however....