Early afternoon update

And now we're getting some intrigue, as the twists and turns have started to develop in today's National Signing Day.

Linebacker Josh Shirley (Fontana, Calif./Kaiser) surprised many by picking UCLA over Miami (Fl), USC, Arizona and Washington. UCLA wasn't even thought to be a finalist for the four-star prospect.

The Trojans officially signed tight end Christian Thomas (Palmdale, Calif./Highland), creating a logjam of three top-10 signees at the tight end spot. Tweeted USC quarterback Matt Barkley of USC's haul at the receiver and tight end spots: "Three of the top TEs in the country and four 5 star receivers added to what I already have?? Feels like Christmas."

Three other players decided against coming to USC. Those are offensive tackle John Cullen (Fullerton, Calif./Fullerton CC), who chose Utah over the Trojans, safety Demar Dorsey (Lauderdale Lakes, Fla./Boyd Anderson), who was thought to be a Florida State commit but chose Michigan over both the Seminoles and Trojans, and offensive tackle Chaz Green (Tampa, Fla./Tampa Catholic), who decided on Florida.

Safety Dietrich Riley (La Canada, Calif./St. Francis) will announce his decision at our ESPN Los Angeles studios in the next hour. Riley is thought to be between UCLA and USC.

More to come.