Some agencies still focus on link building, but I’m unsure I’d call that a strategy. The best link-focused agencies normally have a bag of tactics/tricks they love. These tactics are proprietary, which means it’s difficult to get them explained on Quora.
Having said that, there are several great tactics shared on regularly, and you’ll find plenty of interesting stuff exploring on that site as well (plenty of that is free).
However, with regards to a method, quality link building services plays second fiddle. Links aren’t the be-all-end-most of web marketing – you want them to be successful, however, you also need an effective social media marketing presence, good content, website that converts, etc.
I think, link-building fits into a better online content and PR strategy.
At my agency, we center on a niche market (auto parts), which allows us to both cultivate content expertise (my content creators are car nerds) and cultivate relationships with industry media (I’ve got a reliable set of automotive journalists and bloggers I can reach out to and expect a response). Our strategy:
Create content we hope auto enthusiasts will relish (and our company of car nerds causes us to be somewhat successful at that)
Contact the top journalists/bloggers from the automotive niche (whom we all know, or at a minimum know via email) and “pitch” them our content
If/if the content resonates using the blogger/journalist, we get a mention of the client’s brand name, and almost always the link
The links are editorial and range from best quality sites, so we have absolutely nothing to fear from your efforts. It’s 100% “white hat,” you can’t always say about backlink building. The company name mentions put our clients looking at thousands (or tens of thousands) of automotive enthusiasts. I don’t really know 40dexppky the ROI on these mentions is, but it really can’t be bad.
…Not forgetting, we’ve got an awesome piece of content about the client’s site that could generate search and social websites traffic/interest for many years.
Our “trick” is an industry and niche focus. It’s challenging to create content that actually “pops” when you don’t have knowledge of-house, not to mention that it’s difficult to determine who the best bloggers and journalists have been in a niche market without having done any some operate in that niche for a few years.