xcoder - 9:51 am on Nov 1, 2012 (gmt 0)

Based on what information?

1) Search history and search phrase structure
2) Adsense on other sites
3) Analytics on other sites
4) Chrom
5) Android
6) Maps
7) gmail
8) G+
9) etc. etc.

Trust me, they have eyes everywhere. It is very easy for them to mark and target viewers actually. Something they increasingly do now! i have no doubt.

[edited by: xcoder at 9:57 am (utc) on Nov 1, 2012]