The campaign is based around two conspiracy blogs, and , which are run by characters from the new film and track various bizarre robot sightings across the world.
Transformer robots have so far been "spotted" in , , Rome and . Videos and photos of these mock sightings have been posted online.
One video shows robots appearing at the Champion's League final in Rome.
The most recent "sightings" have been in and the UK. In France two model-aeroplane enthusiasts watched their plane crash and transform into a robot.
In the UK, there was a similar incident .
The overall objective of the campaign is to allow fans to get more involved in the film's back story and find out what has happened since the first instalment.
Thousands of internet users have visited the blogs to date, interacting with the blogging characters by posting hundreds of comments and theories.
Heath Tyldesley, marketing director for Paramount Pictures International, said: "Extending the narrative of the film into the real world prior to a film's release is a great way of building buzz and awareness among fans and viewers, rewarding them for their engagement with the first film.
"Directors are really embracing broadening the platforms of the films narrative to include the web and Michael Bay is no exception."
'Transformers: Return of the Fallen', is the sequel to 'Transformers', which was released in 2007.
Lead characters Shia LaBeouf (as Sam Witwicky) and Megan Fox (as Mikaela Banes) are back in the sequel, joining the heroic Autobots in the fight against the evil Decepticons who are out to steal the sun.
Directed by Michael Bay and executive produced by Stephen Spielberg, 'Transformers: Return of the Fallen' is out in the UK on June 24.
Matt Golding, creative director at Rubber Republic, said: "These clips not only take the world of the film into new spaces where fans can engage online, but also provide additional content around the film driving awareness of the release."
Footage of the "UK incident"
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