Wait I have to tweet to Read the preview... No thanks :)
I feel the same... Forcing me to de facto advertise the product before I had a chance to even read the sample puts into question the quality the content I would find inside the book. My steps were the following. I bookmarked the book. I learnt I would need to endorse it to peek into the sample. I didn't. I removed the bookmark of the book from my collection.
Appreciate the feedback I've made changes to the site so you don't have to share to preview. Here's the preview: 100daysofgrowth.com/100DaysofGrowth-Preview.pdf