Bibulo.us is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. In other words, a good way for authors to make just a bit more per copy on their books or products they recommend.
Sometimes people give us stuff to review. If we got something for free, we'll say so. But that won't affect the content of the review. If we say we like it, we actually like it. We sometimes get comped drinks at bars, too -- but so do you, probably, so we don't specifically call that out.