Issuing a statement equals terrorism?
Are you referring to the Hizb of Mr. Nasullah? Is there concrete evidence in the public domain for Iran to have provided support for terrorism specifically, not in political or 'motivational'(money, indoctrination) spheres? I don't have access to such information, and I choose to not have a bad opinion of anybody. Otherwise somebody would just make similar statements about Israel and the Jund of Mr. Rigi, and cyber-fighting will never end.
I'd like an opinion about a hypothesis: that the two Is are in reality pretty close friends, and this shouting-at-the-other game will remain just that, and no war happens between them, ever. Both need such rhetoric to garner support for their regimes, and breading nationalistic sentiments among their populace, and augmenting their military capacities by creating an apparent enemy. There are such theories floating around, and if you're privy to more information than us lot (or me at least) then I'm always up for learning.