All the activity has led to this...
Paranormal Activity 4 (2012) is the fourth movie in the Paranormal Activity film series. It's also the sequel to Paranormal Activity 2 (2010).
P.S.: Paranormal Activity 3 (2011) serves as a prequel, set in 1988, and it explains the origin of the malevolent supernatural entity in the first two movies.
So, the tagline "All the activity has led to this..." is pretty apt.
Synopsis: After killing her boyfriend Micah, sister Kristi, and Kristi's husband Daniel, Katie (Katie Featherston) disappeared with her nephew Hunter. Their whereabouts remain unknown. Five years later, Katie and a mysterious boy named Robbie (Brady Allen) are seen in a suburban neighborhood. A teenage girl Alex (Kathryn Newton) and her younger brother Wyatt (Aiden Lovekamp) befriend Robbie. One day, Katie is suddenly admitted to the hospital. Alex's mom takes Robbie into their home and since then, strange activities begin to happen in the house.
This movie would definitely be enjoyed by "die-hard" fans of the previous movies in the franchise. The directors commented that they featured a new scare technique, of footage being shown from a laptop in a video chat, which would rival the 'fan cam' from previous movies. [via]
The video chat scare technique is not that bad. But overall, this movie seems to be the "safest" compared to the first three movies, i.e. it's not as scary. The ending is a bit abrupt and you get this, "Huh, that's it?" feeling when the camera pans out.
I heard there's a fifth movie coming out in October 2013. Let's see what story will they give us.