Some agencies still concentrate on building links, but I’m uncertain I’d call a strategy. The great 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.
With that said, there are many great tactics shared on regularly, and you’ll find a lot of interesting stuff looking around on that site too (plenty of that is free).
However, in terms of a strategy, outsource link building plays second fiddle. Links aren’t the be-all-end-all of website marketing – you require them to reach your goals, however, you also require an effective social networking presence, good content, website that converts, etc.
In my view, backlink building suits a better online content and PR strategy.
At my agency, we center 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 good set of automotive journalists and bloggers I will get in touch with and expect a response). Our strategy:
Create content we hope auto enthusiasts will like (and we of car nerds causes us to be somewhat successful at that)
Contact the top journalists/bloggers in the automotive niche (whom we all know, or at best know via email) and “pitch” them our content
If/as soon as the content resonates together with the blogger/journalist, we receive a mention of the client’s brand name, and more often than not the link
The hyperlinks are editorial and come from the highest quality sites, so that we have nothing to fear from our efforts. It’s 100% “white hat,” which you can’t always say about link building. The brand name mentions put our clients in front of thousands (or tens of thousands) of automotive enthusiasts. I don’t fully realize 40dexppky the ROI on these mentions is, however it can’t be bad.
…In addition to, we’ve got an excellent piece of content about the client’s site that could generate search and social websites traffic/interest for a long time.
Our “trick” is undoubtedly an industry and niche focus. It’s hard to create content that basically “pops” if you don’t have expertise in-house, in addition to that it’s difficult to find out who the top bloggers and journalists are in a niche market without having done some are employed in that niche for a long time.