1) There are some types of social networks. First, Social connection sites, for example, My Space, Facebook, twitter, etc. Second, Multimedia sharing sites such as Youtube, etc. Next, I'd mention professional sites (Linkedln). Finally, I'd draw your attention to informational sites, e.g. Do-It-Yourself community
2)Lots of companies are interested in better advertising and promotion of their products
3) I can block some IPs or even countries. What is more, I can use a hosting company which provides blocking as part of their built-in controls
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