Google Agorithim changes.. Noob, few questions

[Dresden14]

1.) Does anyone have the direct link of an official google PR regarding this?

2.) When did these changes go into effect?

3.) When entering the buy/sell services on this forum, are there a certain types of services to stay away from (blogs, or 2.0's, or????)

Thanks in advance.

 

[ly2 from WF]

1 - google algo update - Google Search

2. google algo update - Google Search

3. i dunno