A fake retweet is a retweet manually or automatically generated by a bogus Twitter account.
Fake retweets are used for providing an appearance of legitimacy to the original Tweet and to fool Twitter’s algorithm to drive up the tweet’s popularity. Indeed, retweets can be seen by humans and Twitter’s algorithm as a sign of value and engagement.
Fake retweets may be used for Twitter affiliate marketing for instance.
Automatic retweets may also be used to make real a fake account.