Using Netflix, Hulu, YouTube and others like ABC and NBC for streaming will use your data like normal and count towards the 22GB allowance before de-prioritization kicks in.

Verizon says that the HD streaming is FREE because other carriers will charge you extra to stream HD video on their unlimited packages. Verizon allows you to stream HD Video at no extra monetary cost but the cost is more data usage as HD streaming uses a larger amount of data.