Hi, I would like to know how much link exchange can I do before it will be considered aggressive in google's eyes, it seems there is not much info on the web. I would like to hear from anybody got penalized for link exchange. thanks in advance.
In my opinion, when a certain website or blog have lots of link exchanges which some of those links aren't even related to the website or blog's niche.
Google only talks about "excessive" link exchange - I assume that excessive means more exchanged than one-way-links, but nobody can tell you an exact number or percentage.
More than enough, which means there is a pattern to be traced in the links you build. If google spots that you rely on a particular pattern too heavily, the corresponding adjustments are immediately imposed to make up for the manipulative practices.