I built up a fb page which was 13,000 fans - I did a post on the newsfeed side of facebook with a pic of the t-shirt and saying it was 50% off right now, added a link the t-spring page (click on the newsfeed and it would take you to the order page) and a shop now button and boosted it with £60 of ads which got my ad showed to half of the fans (well, maybe some of their friend of the fans as well).
The t-shirt post got shown to 6500 people (all in the USA to keep postage costs to a minimum), it got 141 likes and 16 shares, so it looked like quite a few people like the design - but likes and shares don't put any money into my paypal account.
I had it on sale for $19.95 which is maybe too expensive? but I don't make any money otherwise... anyway total orders placed - 0!
I had another campaign running as well which does not have any fans but again, got lots of likes and shares resulting in 0 orders.
I'm giving up on teespring now, not wasted too much money, but whats the point if 141 people like a design yet still dont order?