All the five-star reviews of the app on the Play Store are very similar to each other making them seem very fishy. Below is an example screenshot highlighting such reviews -:

As you can see, all the reviews are on the similar lines of “Thanks blackberry Thank you so much blackberry team. I was waiting this app. Its really great user friendly and smooth.” Go through the review pages and you will find many such similar reviews from what looks to be fake Google Plus accounts. It looks like someone from the BlackBerry team, or someone intending to sabotage BlackBerry’s launch party for BBM, is filling up the Play Store listing of the app with fake reviews. The folks over at Android Police sent an email to the BlackBerry officials, and here is there official response -: Hopefully, someone from Google or the BlackBerry team will be able to get behind this matter and find the person responsible for this issue. It might also be possible that someone had purchased 5-star reviews from shady websites for a fake BBM app on the Play Store, which are now erroneously being submitted to the official BBM app from BlackBerry.