Someone Trying To Abuse My Site? Please Advise!

Not sure what happened but when I check my google analytics stat apparently last Friday-Monday I received way more "direct traffic" all of sudden. Take a look at this screenshot:

http://anonym.to/?http://i53.tinypic.com/2d0e80j.png

as you can see there, my usual direct traffic is less than 100 visitors a day but all of sudden i received a huge jump and the peak was last Saturday whenI was getting more than 2000 direct visitors! I totally doubt if all those visitors were really…

Someone Trying To Abuse My Site? Please Advise!