The Pennsylvania Senate passed state anti-SLAPP legislation by a vote of 42-8 on April 25, 2017. “I am grateful for the bipartisan support for this important legislation,” prime sponsor Sen. Larry Farnese (D-Philadelphia) said. “As a lawyer, I will be the first to admit that in many circumstances, lawsuits are necessary. But we must take action to prevent litigation that only exists to harass and intimidate.”
You can read more about the bill here and read Sen. Farnese's post on the passage here.