Sources? Every blogger on YWN is a posek and a potential source for everything and anything. Want a heter? A Psak issur? a Kula? Come on over to YW CR and you will find Poskim from all stripes and communities who issue blanket Psakim in their own names or in the names of other Rabbonim.
Sources galore.
I recently heard from a prominent Brooklyn Posek who visited an out of town community, that he was asked “are you the Rabbi Ploni who holds it is muttar to……”. the Rav was taken aback at the question, as he had never issued such a psak and it was quite a few years that he was in that particular community that someone could have even mistaken what he said. He was told “I read on the internet that you said so”.