OSNs are popular collaboration
tools for millions of users and their friends.
Unfortunately, they also become effective tools
for executing spam campaigns and spreading
malware. Intuitively, a user is more likely to
respond to a message from a friend than from a
stranger; thus, social spamming is a more effective
distribution mechanism than traditional
email. Gao et al. [17] study a large dataset composed
of over 187 million wall messages among 3.5 million Facebook users. The system detected
200,000 malicious wall posts with embedded
URLs originating from more than 57,000
accounts. It is shown that more than 70 percent
of all malicious wall posts advertise phishing
sites. It is also found that more than 97 percent
are compromised accounts rather than”fake”
accounts created solely for the purpose of spamming.
Finally, spamming dominates actual wall
post activity in the early morning hours, when
normal users are asleep.