I've been reading on alternatives ways to gain quality backlinks and increase the Domain Authority. There are a couple of posts that mention using services like HARO or PR requests on Twitter. I'm curious to hear if people use other services (other media outlets or guest blog lists)

- What source of backlinks have you found to be relevant to build your business authority?

- How much time are you spending on a daily basis to build/attend this type of opportunity?

Thanks