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Is delivering scaled images using srcset a good idea? Thinking of delivering one image size to Mobile and another to Desktop. How can I do this for all browsers? Thanks Mike

My Moz spam score is 7%, I think this is due to loads of spam links from a website theglobe.net/the_worlds_most_visited_web_pages_262/ which appeared in the last month. It is a paid inclusion site so not sure how my website got included with a link 654306.freedomltd.com. I have contacted them to be removed but not heard anything yet. The link is showing 768 times from different versions of the same site. Is there anything else I should do?

To preserve link juice should I "nofollow" links to about us and contact us pages that appear at the top of our navigation? I read this article - but I am not familiar with the authenticity: http://www.eminentseo.com/blog/navigation-menu-optimization-best-practices/ Thanks Mike

For the last week we have hosted Live Chat on www.freedomltd.com desktop and tablet. The latest MOZ ranking reports shows 4 increase, 86 decrease and 170 unchanged keywords. Could Live Chat have anything to do with this?