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.
The advantage of paid search is that you can have your website listed on the first pages in a prominent spot on Google and other search engines. However, showing up is only part of the process. You need to create an ad that not only leads to clicks, but to sales or whatever result you're looking for. If you don't know what you're doing, it's possible to write an ad that people are drawn to and click on, however, you don't make sales. Since you pay per click, and clicks can add up quickly, you can lose money.
Good question, for most directories I use they ask for mobile number to send a message of verification, for the ones which phone you for verification inform the company before hand to tell their customer service people to be ready. I know the bigger the company the more tricky these things get you just have to find out what works best to answer the calls even if they give you a direct number to use. 
Hi , the post is really nice , and it made me think if our current strategy is ok or not , 2 things are important " High quality content strategy " and " Good quality Links " now joining those correctly can pose some real challenges , say if we have n no of content writers who are writing for couple of websites, to be generic let’s consider , 1 writer @ 1 website . We have to write make a content strategy for in-house blog of the website to drive authentic traffic on it and a separate content strategy for grabbing  links from some authentic High PR website i.e. CS should be 2 ways , In-house / Outhouse .
Use social media. Build a presence on social media networks like LinkedIn, Twitter, Facebook, Google+ etc. All of these activities help to get your name out and website address out on the internet. Read about how we doubled our social media audience in a week. Add share buttons to your site to make it easy for people to share your content. And write content worthy of sharing.
You may be wondering, why pay to show up in search engines and have people click on your website pages? Can’t you just improve your website’s SEO and get online visibility and organic clicks for free? The answer is that organic search isn’t actually free. SEO strategies are very beneficial to your business, but SEO takes time to take effect, (up to 6 months) and the tactics involve a lot of work toward producing quality content. With SEM/pay-per-click advertising, you see results right away, in the form of your business name on page one of a search.

Retargeting: Each platform offers retargeting to help you reach people who’ve already visited your website. The benefit of retargeting is that a conversion is more likely when you know the prospect is interested. You might also upload an email list and use Facebook Custom Audiences to serve ads directly to subscribers. In the following example, we see two ads that show in the Facebook sidebar to reach former web visitors.
Organic is what people are looking for; the rest of these simply put things in front of people who may or may not be seeking what you offer. We know that approximately X number of people are looking for Y every day. So if we can get on front of those people, we have a much greater opportunity to create long-term relationships and increase our overall ROI.
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