Ok I've read a lot about angela's backlinks and how to find unique sites, which are not saturated with backlinks. but now I don't really know how to inform google that I posted backlinks on different sites. here's an example: I've found a hubpage which deals with my niche. I've left a comment on hubpage with my url. To let google know that I have a backlink left there, it would be smart to ping and bookmark this hubpage, wouldn't it? but on the other hand it would be stupid because I would help my competitor to gain more authority by supporting him with my bookmarks.. so what is the right way?