Spencer is the "perfect girl" of the group. She gets in amor with her sister´s Melissa boyfriend. But when Melissa saw they were beijar she gets angry with Spencer.
Spencer then starts dating a worker at the country club named Alex. But they broke up because of "A´s" falt.
Spencer was the only one of the four that was always competing with Alison.
Spencer also had a crush on Ian, her sister´s boyfriend, who the girls thought killed Ali.
Spencer then falls in amor with Toby. The girls thought at first that Toby may be the person who killed Alison.

Here are some unconfirmed spoilers for the 4th episode of season 4 "The Mirror Has Three Faces":

-Wren will "be all over" 4x10, "The Mirror Has Three Faces."

-In 4x10, there will be some scenes that will make us "scream" and some that will make us "gasp."

-There will also be a shirtless Jake scene.

-Hanna & Wren will have a scene at The Brew in this episode.

-There will be Haleb scenes that will "melt our hearts."

And for 4x07 "Crash and Burn, Girl!":

-Nigel, the blond guy we saw walking Jenna into Wilden's funeral, will reappear in "Crash and Burn, Girl!" (4x07) And while Nigel "may have a darker side," we won't see his darker nature on the surface.

"A" Theories
I think that Toby is "A" because someone locked Spencer in that room with a crobar when they were at the fair and i think he is because as soon as she got out he was straight outside
Facts
Alison has a twin
Mona had Alis diary
"A" (Mona) took spencer to the cliff when she wanted to throw her off
Ali is the sencond "A"
Mona used to encontro, data Noel
Noel broke up with Mona to be with Jenna
Maya and Ali both died
Ali made up a fake twin so she could spy on the pretty little liars

Hope you enjoyed the facts and my A theorie, I hoped i helped you <3

1.“Time To Be Your 21” por Alexz Johnson: Plays when Hanna and Emily talk about Em’s mover to Texas.
2.“Hiding My Heart” por Brandi Carlile: Plays when Aria informs Ezra that, up until now, he was the only guy who had never lied to her.
3.“Far Far” por Yael Naim: Plays when Toby tells Spencer he’ll be there for her no matter what.
4.“Coming To” por Apex Manor: Plays when Aria respostas her door and finds Ezra’s ex, Jackie, standing there.
5.“I’m Not Calling You A Liar” por Florence and the Machine: Plays when the girls receive a text from A at the end of the finale.

Aria, Emily, Hanna and Spencer are all pushed into difficult situations.

As -A continues to play games, the stakes are raised higher as each girl is forced into difficult positions. Aria starts to seriously contemplate her relationship with Ezra as his new family situation continues to eat away at her. Hanna is thrown into the middle of Caleb's family drama when Jamie's shady past comes back to haunt him.
Emily is determined to prove Spencer wrong in hopes of helping her, but she might not be ready for what she finds. In the end, will the Liars be able to get out of their sticky situations or will -A have them right where he/she wants them?

Meanwhile, Spencer searches for respostas about Mona’s time in Radley Sanitarium.

Emily is a competitive swimmer. She was dating Ben but when she knew Maya she discovered she was gay. Maya and Emily were dating.
When Emily´s mother knew her daughter was gay she was a little bit disappointed but all in all she helped her.
Maya and Emily had to separate because Emily´s mother finds drug in Maya´s bag so she tells her parents. Maya had leave Rosewood to go to an estrict place.
Paige is another competitive swimmer in Rosewood, she sees Emily as a big enemy to being the captain of the swimming team. But then they start to hang out many times. But Paige cant accept she is gay so Emily calls a girl called Samara, a gay girl, to have a meeting with Paige and Emily.Paige never goes to this meeting but Emily and Samara made friends.

Hanna has some explaining to do to her parents and the police after she’s found with something she shouldn’t have. Mona spills a secret of Spencer’s to the other Liars – leading to hurt feelings amongst the group. Emily tries to help Hanna, only to have “A” turn the tables. And Aria helps out a friend of Mike’s, who gets the wrong impression of her.
Meanwhile, Shana keeps popping up in the most unusual places. And Spencer’s investigation into who was on the other end of Ali’s mysterious phone number leads her and Toby to Ravenswood – which is unlike any place they’ve ever seen.

Hanna is the most popular girl in Rosewood, who has taking Alison´s place.
Hanna and her mom were abandoned por her father.
She becomes sort of a friend with Lucas, who is in amor with her.
Hanna is once crashed por a car and "A" send a message to the girls telling she knew too much.
She was the girlfriend of Sean, a very popular boy in school but they later broke up.
Hanna becomes closer with a bad boy called Caleb and she gets in amor with him. But she discovers that he was just being with her for a treeat he had with Jenna. Caleb tells Hanna he is sorry and he loves her. But Hanna refuses to talk to him. When Caleb is back to Rosewood they make up.

Here are some officially confirmed spoilers for season 4B of PrettyLittle Liars which airs on January 2014:
~ We will definitely find out if Alison is dead or alive in the Dia das bruxas episode
~ We'll find out mais about Ezra's motives and whether or not he's Big -A in season 4B
~ We can expect some Ezra flashbacks
~ At least one person knows about Ezra and we will find out who in 4B
~ One of the liars will start to suspect Ezra early on in 4B, but will be very careful because of Aria
~ Maggie will be in season 4B
~ We will find out mais about Mrs. DiLaurentis
~ Mike and Andrew will be in 4B.