This post provides an annotated bibliography of some work on using social media (in particular Facebook) as a pre-registration/pre-university/induction tool. The references given can also be found at my Delicious site. Some examples of the use of Facebook for induction purposes are given at the end.
The three biggest usage spikes tend to occur on weekdays at 11:00 a.m., 3:00 p.m. and 8:00 p.m. ET. The biggest spike occurs at 3:00 p.m. ET on weekdays. Weekday usage is pretty steady, however Wednesday at 3:00 pm ET is consistently the busiest period. Fans are less active on Sunday compared to all other days of the week.