I sit in the dp buy sell trade exchanging pm with webmasters who want to sell me links but i can help but wonder if one of those guys is a google spy waiting for me to transfer money then "BAM" i'll get slapped with a penalty. I know it sounds like i am a little paranoid but seriously, what would stop google from doing that. if i was google and i was sick of people trying to cheat the system i'd totally bait people like that.
Google would not waste their valuable time and resources on doing something like that, believe me. They are far too greedy to employ people just to do that. Honestly, you're worrying about nothing.
not sure how they exactly do that.. but they admit that they can't do it accurately. But google is too advance to recognized those site that buy and sell links..
Google does NOT know how to detect paid links... unless someone reports about it. Google has some of the most expert economists (call them internet economists) working at their office who can make algos to detect who is faking it and who is not. Its useless to fool Google.. as sooner or later... you may discount all your efforts. Google is concerned about relevancy and user experience. As long as you are maintaining the same... it doenst matter if you are purchasing links or building them.
I don't know... I wouldn't put it past Google to have "spies" that look for bigger sites using these methods. They can also reverse engineer and figure out the patterns of code used to display the backlinks, especially in the "link exchange services". I would only do it on the outer layers of a linkwheel-type of website network. Build some of the crappy sites up and then point them toward a random selection of internal layers of the linkwheel, etc...
they don't have much time to spend on us. i have never seen any any one getting caught by exchanging links. unless you complain Google. or get caught red hand. otherwise its just ok. thanks