Some agencies still center on link building, but I’m uncertain I’d call which a strategy. The excellent link-focused agencies normally have a bag of tactics/tricks they love. These tactics are proprietary, which means it’s hard to find all of them spelled out on Quora.
That being said, there are some great tactics shared on regularly, and you’ll find a lot of interesting stuff exploring on that site at the same time (a lot of that is free).
However, with regards to a method, best link building service plays second fiddle. Links aren’t the be-all-end-each one of online marketing – you want them to achieve success, however, you also need a great social websites presence, good content, website that converts, etc.
In my opinion, backlink building fits into a better online content and PR strategy.
At my agency, we focus on a niche (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 decent set of automotive journalists and bloggers I will reach out to and expect a response). Our strategy:
Create content hopefully auto enthusiasts will delight in (and our team of car nerds causes us to be somewhat successful at that)
Contact the top journalists/bloggers from the automotive niche (whom we realize, or at a minimum know via email) and “pitch” them our content
If/if the content resonates together with the blogger/journalist, we obtain a reference to the client’s name brand, and usually a link
The hyperlinks are editorial and come from the top quality sites, so that we have nothing to fear from your efforts. It’s 100% “white hat,” that you can’t always say about link-building. The manufacturer name mentions put our clients before thousands (or tens of thousands) of automotive enthusiasts. I don’t actually know 40dexppky the ROI on these mentions is, but it really can’t be bad.
…Along with, we’ve got an awesome bit of content in the client’s site that can generate search and social networking traffic/interest for a long time.
Our “trick” is definitely an industry and niche focus. It’s tough to create content that actually “pops” once you don’t have expertise in-house, along with that it’s difficult to determine who the best bloggers and journalists have been in a niche market without having done some are employed in that niche for a long time.