I got an answer from GalleriaDiGiani:
The initial 10-15 views that come within the first minute or two are "botcrawlers"...they troll the internet, collecting links and information...they were explained to me as being from search engines, gathering information to strengthen searches. They are a good thing, but they are not real people. You will see that happen every time you tweet a listing.
By the way, a general tip about google. Please make sure you tweet a LOT more than just your listings. If all you ever tweet are your listings, you will not get a lot of followers. Your listings need to be a very very small percentage of your overall tweets. If you don't share interesting and fun information, people will have no reason to follow you on twitter.