Is the Facebook party over?

An interesting study undertaken by Ypulse (Youth media specialists in the USA) found evidence of Facebook fatigue:

"25 percent of the students reported spending less or no time at all anymore on the site"

If these people are spending less time on Facebook - what are they replacing it with? Is it a cultural change or is something else going to come along and replace it (remember MySpace?)

Source: PSFK