I purchased a "tweet blitz" package for my time travel romance "Rings of Passage" over the Martin Luther King holiday weekend (in the US) for $39.99. Unfortunately, based on my KDP sales report, I sold no books, not one. Some of the tweets included a link to my book trailer. The views for this trailer only increased by no more than 10. I hate to leave an overall rating of "poor," because BooksGoSocial has always been generous with its promotion packages, going over the tweets originally agreed upon, and I appreciate that. Personnel are very courteous and helpful. However, the rating is based on this particular tweet blitz which really did very little good for me. I wonder if Twitter is falling out of favor, or is perhaps not effective for selling books, as it once was.