Some 236 groups related to the Virginia Tech killings have been set up on Facebook, a sign that Internet social networks are beginning to replace email and cell phones as the preferred method for spreading information quickly among younger generations, writes Reuters.

The "I'm ok at VT" group included a list of those killed as well as details about the condition of others injured.

One student on the Virginia Tech campus formed "Christians Praying for Virginia Tech" and attracted 1,378 members. "Canada Supports Virginia Tech" drew 309 participants. Another Canadian led group drew in 5,200. "A Tribute from Muslim Students," created by a Loyola Chicago student, attracted 32 members.

Some students have posted a black ribbon with the university logo "VT" over it to commemorate the victims, replacing their own profile photo, and spread invitations to attend a candlelight vigil on Tuesday evening.