The most popular way of building back links right now is guest blogging.
Why is it so popular? Simple, it’s so effective at driving up keyword rankings – when it’s done consistently and when those guest posts are published on authoritative domains that are relevant.
It’s been in the back of my mind for some time now, actually since the first iteration of the Google Penguin update, that guest blogging may become a target of Google. I believe that guest blogging will still continue to be effective after the next major Penguin update, however the way in which you build links through guest blogging will change.
This is how I think guest bloggers will be impacted:
Read the 5 reasons here at Search Engine Journal