If you are webmaster and you have your own blog, you probably aware of this spammer. Apparently there is a spammer roaming in internet to (probably) increasing its page rank by making spam comments, Bibomedia.
Just google "comment by bibomedia" and you will see all of the comments posted are only a single: 
Take a look at this snapshot, taken from the first site of the of string I mentioned before.
My comment? This is definitely spam. Akismet failed to filter this because they depend on hyperlinks carried by spammer. Just delete and don’t bother to answer them.
Popularity: 18% [?]
Tags: Blogging, Spam, Wordpress
Using
Ada lagi tu, spammer baru.
Yang promosi leoxa.com.
Sampah juga bener2x.
Using
@ivan
iya tuh yang kangaroo. Tiap minggu dia ngespam shoutout saya. Tapi masih aja muncul. Menyebalkan sekali.
Using
Memang tidak bisa diblok kata-kata/IPny?
Pas dulu si, waktu saya masih pake blogspot, saya juga pasang shoutbox. Dan ada fitur itu.
Using
saya sejauh ini cuma bisa ngelaporin sebagai “junk”, saya juga ingin tahu gimana cara mengblok ip… saya rasa saya akan mencari tahu nanti.