When trying to find an SEO service it can be exceedingly difficult to set a list of criteria especially once you don't know the SEO process. Almost every SEO customer would expect a good SEO service to appear in the top of the major search engines for all their relevant key phrases. Although this concept seems very logical it doesn't necessarily represent upon the other agencies that aren't. There are literally thousands of SEO companies on the market and having a rather modest number of places on the very first page, it is not possible for all the agencies to show their worth by being on the initial page. It's only when you begin to break down the current high performing SEO agencies which you begin to develop a better understanding as to why they're there and most importantly why you shouldn't utilize them. There are infinite tests you can do on an SEO company but I would strongly urge anyone to perform those listed below followed with any further tests you think to be appropriate.
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Search their firm name
Hunting their business name will inevitably bring up their directory listings, article submissions and social networking pages but if the company is relatively big, there'll be some comments somewhere. It is highly probable if someone has had a bad or good experience with an SEO company, they'd have mentioned it on a webmaster forum or a blog. It is very important not to take these reviews at face value because some dishonest SEO agencies market their solutions this way, if it's a forum look at their post count, join date and answer from other forum users.
Look at their portfolio
If an SEO service is good at what they do there will be an infinite supply of testimonials, don't be afraid to ask the agency for previous examples of the work. If an SEO company advertises a large amount of customers but yet only shows a set few of testimonials, ask them why or even better ask the owners of these websites. Webmasters are more inclined to let you know exactly what's not functioning or has not functioned as opposed to what is working nicely.
Check their back links
A large proportion of online marketing is back linking and there are endless amounts of free tools to check the back links of a particular site. The standard of the websites linking to this SEO Company depends upon the ethical standard of the work. If you discover an agency to have a huge amount of back links from websites you would consider as being spam it is highly probable that this is the approach they will take to marketing your site which is against all major search engine positions.