Yes sure you can. Most anyone can advertise in the marketplace. Just don't be a spammer. Being that the marketplace here is based on reputation, you'd get more positive responses if you participated some in this great community. If all you want is to make money, stick to Ebay. I do a lot but no ord...

My name is Jack, I sell thinkpad tablets on ebay... So... can I show my stuff here? If that's not allowed, I never say again, sorry...