What if I use Tier Link Building technique? Will it make my site vulnerable to be hit by google? Why and how would google spot that the tier sites which I am using to give links to my main site are being run by me as well? I can think of two ways by which google can get to know my modus operandi, firstly by tracing the server IP and secondly by seeing the fact that many a site are giving links of just one particular site, thus raising the eyebrows of google in suspicion. Any thoughts on that? How can I make my tier link building process safe?