The Pretty Little Liars writers have been promising some real answers about Ezra, and on tonight's Season 4, Episode 17 ("Bite Your Tongue") they finally delivered.
In the episode Spencer, aided by some study drugs, stayed up late reading Ali's diary and looking for clues. She found a big one: Ali was seeing an older guy. Said older guy had a thing or three to say about writing, liked to hang out at a bar near Hollis, and specifically ordered a weird combo: beer and boysenberry pie.
Armed with this info, Spencer headed to the bar to see what she could find out, and she stumbled on an answer she didn't expect. See, Ezra was there. And guess what he'd ordered? If you say anything other than beer and boysenberry pie, you clearly haven't been paying attention.
Spencer immediately jumped to the obvious conclusion: Ezra was the one Ali was seeing. As if those clues weren't enough, she also realized something else. The beer? Call Board Shorts Ale. Damn.