Lumezanu et al. [18] perform a joint analysis
of spam in email and social networks. Spam data
from Yahoo’s web-based email service and Twitter
are used to characterize the publishing behavior
and effectiveness of spam advertised across
both platforms. It is shown that email spammers
that also advertise on Twitter tend to send more
email spam than those advertising exclusively
through email. Furthermore, sending spam on
both email and Twitter has better exposure than
spamming exclusively with email: spam domains
appearing on both platforms are looked up by
an order of magnitude more networks than
domains using just one platform.