I have a portal that has a good textual content. It is kind of game. When user come to the portal, ajax pop up shows to offer to a user credit and gift. Articles are rotating on home page, but if user doesn't have javascript anabled, than only couple articles shows without rotating. Could be this any problem for google? I heard some stories that google doesn't like pages with pop up and also doesn't like pages where different content is showen. It is the same content with exception that user with javascript will see more stories because it will rotating, but how will google know that. What are your thoughts about that since my goal is to get primary traffic from Google?
Yes, I think it is a possible problem as far as how G views your site. I believe it is a trust issue. These features can be very legitimate, but they can also be signals that the site is spam. So, G's algo will look at other factors. Most important will be what other sites link to yours. If the other sites are spammy, G is more likely to conclude that your site is low quality. If other sites linking to you are well trusted, G is more likely to conclude that your site is ok.
But isn't true that google doesn't read javascript? If Google can not read js then he won't even know that any ajax pop up dialog message exists. That is where my confusion comes from.