The rule of thumb is that the following types of sites are not allowed:
- Sites where people upload anything to share, whether that’s files, photos, songs or videos.
- Chat scripts, or any other type of live messaging systems. Such software works by continuously asking the server for new messages, which puts a lot of stress on the hosting servers. PTC and traffic exchange sites also sort-of fall under this category.
- Any illegal (or legally questionable) content like pornography, torrents, cracked software, etc.
Social networking sites, Q&A sites, URL shorteners on their own do not match any of these criteria, so they can be hosted here. But, that’s only if the content being shared on those sites does not violate the terms either. So a social networking site about sharing pirated video games or a URL shortener linking to pornography will be taken down as well.