I see posts like this from time to time, I was just wondering as a friend of mine noticed a few satoshi's going in, He thought it was free but I noticed his balance did not go up across all the addresses he had generated in that client, Can you confirm your actual total balance has gone up?
I was thinking it was to do with these "mixers" that are popping online, But even they cant just take coins out and replace them from a different source, It does not work like that.
The satoshi junk is just spammers who want you to look up the transaction on a blockchain explorer site and see their name tagged on the address. Other theories are that the dusters are trying to get you to use the satoshis as a way of tracking addresses.
Your balance can go up without any address you see in the user interface being paid. Bitcoin wallets have other addresses not shown to you, that are used for change. These can be discovered from past blockchain transactions, and people can send junk payments to them also.