Investigation requested by tarsua.
I don't know the purpose of why I was requested this. If there is any more evidence please PM me so I can add to the list
BuddyIsrael
Addresses:
1EdgXM2gbYedANE8yaZ1kC5QtXQHWNMSPC
1GAGfamAuSFwcrrYscQ2VrUhPEfHWPMXHM
Speaks german
Almost all of his posts are buying or selling something in marketplace
Gismo28
Addresses:
12NUDU4oKg2kjCuEqJiFNziQJ6mjM4GdoU
ALSO speaks german
MANY of his posts are in marketplace

It is possible that they are the same person. there are 2 pieces of evidence that link them together
I could do a thorough investigation of the addresses and see if there is anything linking them together, but this would cost a fee (it takes quite a long time)
https://blockchain.info/taint/1GAGfamAuSFwcrrYscQ2VrUhPEfHWPMXHM
https://blockchain.info/taint/12NUDU4oKg2kjCuEqJiFNziQJ6mjM4GdoU

They also have left trust rating for each-other:
https://bitcointalk.org/index.php?action=trust;u=513698
https://bitcointalk.org/index.php?action=trust;u=404902

People that have alts often leave trust for each other to help them out with their business (whether it be scamming or genuine business).
This looks like a very direct connection here. I would say I am 65% sure they are connected, 100% when I connect their addresses, for example there is apparently a transaction between them, if that is true (and I find the reference) that means they are the same person.

The password for BOTH of them have been changed recently as well, which could link each of them.

Some more information found from tarsua
https://bitcointalk.org/index.php?topic=1073492.0
Conclusion: Nothing directly links them together, however it is very probable
Evidence: Both german and both posts are in the marketplace buying the same things, left trust for eachother