This seems to have culminated in a game that was released recently called Tiberium Alliances. Designed by EA games, this follows the theme of the old Command and Conquer games designed by Westwood games and eventually bought out by EA. This game follows the same facebook style, such that to get maximum efficiency, one would only need to log in every 10 hours. Because this game is designed by professionals, we get some very good graphics and above par gaming (at least, for facebook style games.) The battles are a simple grid based system: the attacker lines up his/her forces in up to four waves of up to nine units each, while the defense is set up (before hand) on a nine by eight grid (with some terrain features to slow the attackers down). The attackers move vertically, attacking anything in their path, but only stopping when they are in range of the target they are proficient at attacking (think rock, paper, scissors). The defenders move horizontally, lining up with the closest attacker that they do best against.
As the name would suggest, this game is geared towards interpersonal relations. Early on, you are encouraged to form an alliance to team up with other players. This has several benefits: bonuses from captured points of interest (such as resources per hour, or extra damage bonuses), the ability to work together to destroy a tough target, and the protection of a group against other players. Unfortunately, none of my friends are interested in playing this game with me right now. This means I am pretty much on my own, because I don't really feel like joining up with a bunch of strangers. Well, to be more accurate there are some people who I became friends with, but they are part of a non-pvp (player vs. player) group, and that restriction doesn't interest me. Now, usually I would prefer to leave other players alone, but every once in a while I come across a jerk that just needs to die. This is a normal rule of thumb, right? See a jerk, destroy a jerk.
Well, anyway, let me give you an example of how this game goes. my alliance is allied with the non-pvp groups, vypermax, so I'm not part of their group, but we are on friendly terms. I consider myself their unofficial attack dog, seein' as I can attack players at will without besmirching their reputation. Today, I got on to find that one of the vypermax guys near my secondary base had been destroyed and there were about three bases from Risen Phoenix had set up nearby. Now, as I am a shamelessly selfish individual, my first thought was "Those guys are way too aggressive to be so close to my base." So as I began to move my main base down from the north to rejoin my minor base, I went ahead and attacked the base closest to me (with my minor base's forces). The defenses it had set up were uninspired at best: all they had were a bunch of tanks beside a wall all bunched up in the four squares closest to the left. Far above them, in the upper left hand corner of the base, was my target: the Construction Yard, which is the heart of the base. Destroy that, and the whole thing crumbles.
Now these tanks are all best used to attack vehicles so I came up with a diabolical scheme: I sent in a wave of infantry followed by a wave of tanks: all on the other side of the base, like so:
The plan is to draw them away from the left side, while my bombers slip in and destroy the base. As you can see below, it worked exactly the way I had planned. Even though my infantry and tanks were all but destroyed, the bombers managed to end it all with almost no resistance.

Then, I sent out an email to about sixty of my allies to this affect:
Danyo-kun:
I see that risen phonix is attacking: I already destroyed one of their bases, but if we don't get more support here soon they'll overrun us. Are we calling troops or abandoning the territory?[coordinates of the attack]
(Yes, my name is Danyo-kun. Shut up, at least it doesn't have numbers)
As well as an email to the guy who roasted my ally's base:
As I'm sure you've heard, the vipermax clans are a bit, PVP starved. I recommend calling off your clan, before things start to get really messy.
~Daniel, Commander of the Shinigami
I continued destroying the enemy bases while I waited for a reply. Of course, they did not remain idle and I soon found myself under attack by the commander of the Risen Phoenix. Unfortunately for him, he wasn't even a match for my minor base, so I trashed his base too, then sent him an email (now that I knew who the commander actually was.)
We do not need to continue this war, though I am somewhat enjoying it. It's up to you: you can cease fire or I can just finish off your entire alliance. For your information, I am an ally to the Vypermax clans: do not attack them or me any more.
P.S. You've only been fighting my weak base. My strong base will be here shortly.
Yes, my strong base did arrive shortly after, and destroyed the original attacker. I soon got this in response:
Hey man,
I wanted to apologize for this whole affair. We merely thought that the guy was inactive and was the only reason we went after him. It was mostly my fault. You have exacted revenge on me and i deserved it. It was my mistake. We wouldnt of done anything if we thought he was active. Again i am sorry. We did not want to start a war or anything.
Just wanted to apologize.
Total count: four enemy bases destroyed and five failed attacks against me. I finally heard back from the vypermax commander too:
we got a NAP [non-aggression pact] with them now buddy..the cic said it was his fault and said sorry.. I still WANT YOU!! lol..your a feaking power house!! please brother come join us...i have to keep trying lolol ill never quit trying to get you on our team hahahaha
So anyway, this game can be summed up like this: low play-time requirement with decent strategy and interesting player interaction makes for a fun, free game.