You may need to scroll thru all of the available Widgets using the Right Arrow on the remote until you get to Widget Bizzar, where you will firn Facebook and Twitter.
I tried pushing the "A" key it gives me the same results as pushing the "+" key. I scrolled through them all.
I still have just the basics like weather, traffic, horoscopes, etc....
I think they must be rolling the Widget Bazzar out gradually across the country, it was not available to me last night but is present this morning here in North Texas.
And yes, as matcarl said, the A button does launch the Widgets, just like the Widgets button does.
Verizon FiOS TV, Internet, and phone
QIP6416, IMG 1.6.2, Build 08.58
Keller, TX 76248
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Some markets or (VHO's) had the update released yesterday (7/15) while the rest of the country is getting the update today (7/16).