After more than a year of posting a “Daily Nightly” blog, NBC Nightly News anchor Brian Williams is expanding to a video blog that will give a quick glimpse at the day’s top stories by midmorning. The “Early Nightly” went live earlier this week on the “Daily Nightly” page as a one- to two-minute video blog recorded by Williams after the 9:30 a.m. Eastern time meeting held by members of the NBC Nightly News staff.