Originality is extremely important. One of the major steps to being an expert is being original with the content you produce. To be successful in the world of social media, you need to focus on one of three things: be original, have an impact or educate. Doing all three is great but you need at least one.
There is no point in constantly reposting other people’s content. First of all, you lose the audience. The photos or videos you posted were all about someone else. No, the visiting audience doesn’t remember who you are. Secondly, this stunts your brand development. The visitor doesn’t know how to feel about you or your page! Lastly, it’s fucking lazy. Create your own content.