When I saw this post the page had 404d. However, the page was still active in the Google cache[1]
It is not just Github being targeted, a lot of other large websites with user generated content are also being spammed with this content[2][3]
The spammers are linking the content to blogspot blogs so that they can: 1. hide the referrer from their affiliate program (to prevent getting banned for spamming) 2. to utilize the temp increase in search engine rankings 3. save money on domains for one-off usage
Since the "live stream" is just a one-off game that will only be popular/trending for 1-3 days in which period the spammers will use a lot of macro scripts/bots to spam these websites. Believe it or not, even a "nofollow" link can give you an advantage in search rankings. They spam them to death in the "popular period" and then bank money from the affiliate program[4]
[1]http://webcache.googleusercontent.com/search?q=cache%3Ahttps... [2]http://shine.yahoo.com/author-blog-posts/watch-38-enjoy-flor... [3]http://webcache.googleusercontent.com/search?q=cache%3Awww.f... [4]http://www.officialtvstream.com.es/passport/signup.php?price...