Hi, I have been actively building backlinks to my site since last couple of months, this links are web 2.0, profile links and comments. Some of them get indexed naturally and some I send for premium indexing service and manual indexing. Now my question is, due to this indexing my site is getting good amount of backlinks fast, keywords and ranking, traffic is increasing and getting sales too (by the way its amazon niche site). Someone told me that if I keep making such backlinks then I will come under google penalty so to avoid google penalty I have to make regular backlinks every month, is this true ? Do I have to keep making backlinks every month even after ranking for my keyword ?