Style Guides are an important part of journalism production. It is an important document in which the specific language a publications writers must use and is dictated by the editorial staff. It offers direction on grammar, punctuation and style but also sets the tone of the publication and the limits of creativity and discourse. The Buzzfeed Style Guide is particularly good. It’s online, free and updated regularly. This is great reference point for the fast moving pace of web-speak.
You can find a link to it here.