To remain competitive on the SERPs, you need to not only have keen insight into your own marketing strategy, but also what others in your industry are doing. You need to be able to pinpoint keywords for which they rank that you are not. You also want to be able to gauge their performance, including their acquisition of Quick Answers and other special features.
If you take full advantage of social media to promote your top quality content, you want to keep in mind that engagement matters for SEO. Engagement helps to not only improve your online reputation but also to make connections and generate leads for your business. Content that gets tons of engagement on social media platforms will rank for the topics they cover. According to Moz, “to determine success, an algorithm looks at whether users engaged. If more people engage that’s a clear sign that their algorithm is showing this right content; if not, their systems will audition other content instead to find something that generates that interest.”
SEM is the wider discipline that incorporates SEO. SEM includes both paid search results (using tools like Google Adwords or Bing Ads, formerly known as Microsoft adCenter) and organic search results (SEO). SEM uses paid advertising with AdWords or Bing Ads, pay per click (particularly beneficial for local providers as it enables potential consumers to contact a company directly with one click), article submissions, advertising and making sure SEO has been done. A keyword analysis is performed for both SEO and SEM, but not necessarily at the same time. SEM and SEO both need to be monitored and updated frequently to reflect evolving best practices.
Regarding Link Detox, links it diagnoses as Toxic are generally fine as they're either not indexed by Google or have malware/viruses/etc., but I recommend a manual review of any diagnosed as Suspicious. I used it recently to get started cleaning up our backlinks and some legit sites and blogs were under Suspicious simply because they didn't have many links pointing to them.
Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.