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In cleaning up the backlink profile for my parent's website, I've come across quite a few dead links. For instance, the links in the comments here: http://www.islanddefjam.com/artist/news_single.aspx?nid=4726&artistID=7290 Do I need to worry about these links? I assume if the links are no longer active, and hence not showing up in webmaster or moz reports, I can probably ignore them, but I'm wondering if I should try and get them removed regardless? I've read that google is increasingly taking into account references (i.e. website mentions that are not links) and I don't know if inactive spam links might leave a bad impression of a website. Am I being overly paranoid? I imagine disavowing them would be pointless as you can't attach a nofollow tag to an inactive link.

In light of G's view of links from directories and other sources I have heard that links for audio sites like soundcloud.com can be beneficial. Has anyone had any positive experiences building likes from sources like this?

Although Google and Bing have recommended that the same URL be used for serving desktop and mobile websites, portals like airbnb are using different URLS to serve mobile and web users. Does anyone know why this is being done even though it is not GOOD for SEO?

Well Guys there are lot of discussions in almost all the communities, blogs, forums about Post Penguin impact. Google says that if find that you're involved in any link building activities, we may penalize you. People out there have already started their developed links. But what if our competitors would have developed those links. Initially it was okay to develop one way links, I even developed lot of quality, but deliberately, links. around 95% links are placed manually, if return to some favor or money but all links looks natural. Most of the links I developed through content only, like articles, blog comments, PR submission, etc now really skeptical about the quality (after hearing lot of talks and reading n number of posts). Now, can I also submit my competitor's websites in 1000 topic directory (obviously not in any spammy directory), would it effect that website adversely? What if I spun an existing content and submit it into 500 article directories and give backlink to competitor site from using only one anchor text (which is obviously the main keywords - highest sales generating keyword) I look forward to some experts comments.

I'm about to purchase a domain that has highly trusted links pointed to it. I would like to 301 redirect that domain to point to a brand new domain in the same niche. Some of the links that the expiring domain would take me a long time to obtain so I am thinking to use this method to my advantage. I know that this is not really a legitimate way to go to build backlinks, but surely this is going to give me good serp improvement which is my main concern at the moment. I am going to test this method to see if it benefits me in anyway but I would like some opinions to this please.

Using Open Site Explorer I was reviewing a sites links. This site happens to appear at position 2 in Google for a key-term that I am targeting for one of my sites. Most, if not all of the links appear to be coming from some very questionable sources that have absolutely nothing to do with their sites content or business. Some of the page titles are : Free Music - Free Music Tampa Bay Florida Fishing Guide Free BDSM and Bondage Sex, BDSM XXX, Fetish Por... LAX Car Rental Reciprical Links Page - Add Your Link Casino More Links Is this practice going to end up hurting their site and catch up to them at some point? From what I have read, these are not the type of links that you want to be going after.