Pretty Little Liars (TV series)/WMG

Mike is gay.
And that's why he never shows up anywhere.

Mike is on drugs.
Which is why he's all strung out all the time and spaced out.
 * This is actually confirmed as early as the first book but may not be true in the series

Mike got blackmailed by A to break into people's houses to protect his sister.
Which is why he won't tell anyone.

Mike is in love with his sister, which is why he's taking out his anger out on her friends.
And why he doesn't want to talk to anyone about it.

Lucas will lose his virginity to Hanna in an identical way to their roleplay celibacy scene he was introduced in.
With or without Caleb watching.

Mona is Obfuscating Stupidity and will help figure out who A is.
Or she is A.
 * But then what the hell does Mona want? Let's assume she found Ali's diary and knows everyone's secrets... why become "A"? I get that she's angry for being ignored by these best friends when she wore glasses and braces and acted totally desperate to fit in... but what kind of idiot would devote soo much time and energy to this whole "blackmail operation"??
 * Well, if they follow the plot of the books, it would make sense as to why Mona is A.
 * As the series goes on, it's very obvious that A is no longer after them for blackmail or revenge or whatever else any more. A's new goal is to keep them from learning about something.
 * A recent episode had her break into the assistant principals office, spot a fraudulent piece of bribery from a couple of spreadsheets, then use it to blackmail said assistant principal. Clearly smarter than she lets on for the general populace.
 * Confirmed. Mona is A.. or at least part of the group who make up A.
 * Her motivation this time seems to be different though. It seems that this time she just really wants Hanna, her first friend, all to herself and will do anything to make it so.

All the girls' phones and homes are bugged
... and the bugs and cameras are tiny and/or invisible which is why they haven't been found yet. How else are we going to explain A's God-like omniscience??
 * This one actually seems to be confirmed for Hanna's phone as of the latest episode

Ali has a twin
Ok, this isn't a wild guess, I know this is what happens in the books. But that still doesn't explain the mom's attitude, and where the heck is Alison's Dad? Did Alison's Mom and Spencer's Dad have an affair? Are Ali and her twin Hasting's daughters?
 * Well Ali and Spencer are not twins and in the series Ali is not Peter's daughter. Jason is his son though.

Jenna + Garret + Mona = A
Okay we all know  in the books, but the possibility of having multiple people playing A has been raised before. It's highly likely that Jenna and Garret are involved, as they discuss  in the summer finale. They were lead there by anonymous messages from A, which means Jenna and Garret are part of the A conspiracy. However, it's very obvious that there is a third person who has access to information that neither of them do. This person is a student in the same English class as the four girls (explaining how she knew that Aria was Ezra's student, even though Aria had just learned that herself), has a grudge against them, and somehow knew that they were invited to Mona's birthday party in Season One, even though it had just happened. This person must be female, since she said she'd be at Mona's party, which was girls only. She also knew about Hannah's shoplifting. (Presumably, since she knew Hannah was arrested for it and is probably the person who tipped the mall security off to the fact that it had occured in the first place.) There's really only one person who fits that profile and that's Mona.

There are many minor As, but Alison is the leader.
Alison (the real one, not her twin Courtney) is behind everything, but gets others to do things for her under the guise of "A." So there are a lot of people who pretend to be A (Jenna, Garrett, possibly Mona, etc), but they don't know who the ringleader is or what her ultimate goal is. They're just happy to ruin the lives of the Liars.

Eventually, one or more of the girls will say "Screw it", decide to reveal all of the secrets they're keeping and tell the whole world about A.

 * It's a common enough trend in fiction that the only way to deal with being blackmailed is to spill everything the blackmailer has on you, so they don't have any ammo on you.
 * Hanna tries this in Flawless but it doesn't work.

Neither Garret nor Jenna are A, or part of A, or in any way affiliated with A.

 * In "Over My Dead Body," they too received instructions from A and were given a means to get what they wanted from their "frenemy" A. Of course, it'll come at a cost and A now has blackmail material on them...

Lucas is being blackmailed by A because of his gambling addiction.

 * In 2x14 when he shows Hanna some of the trash collection pictures, the first thing on the screen is an online gambling site. In 2x15 before all the drama, he tells Hanna he can't afford to pitch in for the party. A finds out, and uses this against him.

Lucas lost money because of his gambling addiction and Lucas has nothing to do with A.

 * As above, but nothing has to do with A. Every single conversation he has with the crisis hotline has to do with classic hallmarks of gambling addiction (I almost got caught, I'm in too deep, I got sucked in, I feel powerful, I lost it all). He also refers to a group (They will never forgive me, they will make me life a living hell), so it's surely at least partly some kind of group that he's lost the money for. Could be his parents, the school or some other group of people at school. His solution isn't murder, it's to leave town for good.
 * Confirmed. Turns out to be Caleb who apparently had $4,000 stashed away. Lucas lost it, and the group he's referring to was Caleb and Hanna.
 * Well to say that he has nothing to do with A can't be confirmed.

Alison is alive but not A

 * She appears to have saved Emily in 2x12. She also visited Hanna in the Hospital. She is in hiding because A is after her as well. She was offering Emily the chance to run away with her. This makes what she said to Emily make sense.

Also Ali was being blackmailed by A

 * A wanted her to expose Spencer kissing Ian, Aria's dad affair and threatened to expose her for kissing Emily which explains her hostility towards the girls.

Aria is the MAIN A

 * It seems crazy, but look: http://sarahinwonderlandd.tumblr.com/post/19606529806/a

& also this:

http://spiderann.tumblr.com/post/21983421023/another-theory-guys-just-a-theory

they actually have some valid points. ( Note = not my posts)