Phraseology is important for effective communication as well as for understanding the cultural aspects of languages. There are a lot of languages for specific purposes (LSPs) that possess their own terminologies and phraseologies (e.g. the language of medicine, legal language, etc.). This research, however, does not focus on such specialized languages. Instead, it examines collocations in blogs to provide insight into the phraseology of an informal piece of writing. The aim of this research was to study collocations that occur in blogs and examine what they can tell us about the nature of blogs as well as to point out the differences between the subject fields blogs focus on. This thesis adopts a corpus-based approach by focusing on collocations in an English monolingual corpus consisting of three subcorpora. Results suggest that the most frequent collocations were topic-related ones and that they do not offer a general picture of the collocability shared between blogs. They do, however, show how bloggers use collocations to address their target audience and grab their attention. This research can thus be beneficial for both bloggers, who can improve their writing, and students who want to improve their English language proficiency.