Interesting that apparently the data generated by Reader was not valuable enough for Google. +1 are sufficient for Google to understand people's interests? Seem

Interesting that apparently the data generated by Reader was not valuable enough for Google. +1 are sufficient for Google to understand people's interests? Seems to me information junkies could have been an important source of information. But then the SEO spammers probably also just created Google Reader profiles with fake reading lists? How is the situation on G+, is it easy for SEO spammers to game it or is it harder, for example because of the real name policy?