Hi SEO 4 Attorneys, it could be any thing is this for your site for a clients site.It could be an attempt at negative SEO from a competitor? The thing is people may try to push 100's of spammy links to a site in hopes to knock it down. In the end of the day my best advice is to monitor your link profile on a weekly basis. Try to remove negative links where possible if you cant remove them then opt for the disavow tool as a last resort.
Part of the problem lies with ads on mobile. Mobile ads take an average of five seconds to load — about double the time it takes for desktop ads, according to research by the Media Ratings Council. Research from Adobe also found that 80% of marketers don’t have a mobile strategy in place for the next year — a serious point of concern considering that mobile devices now make up 57% of all time spent on digital media, according to comScore.