When I look at the service description, I notice the following points:
1. each company is possible to accept or reject ratings according to their own decision (in my opinion, it thus does not meet the general known standard of a rating portal. However, I get the impression that the seal and the customer reviews could be such a thing. Since only a closer look helps).
2. only a verified email address is sufficient to give an assessment. For me it stops here already with the fact that the evaluations can help me further, since they can give already no high credibility.
3. the costs are extremely high and for smaller companies regarding their marketing budget not accommodating.
For these two reasons, provenexpert could not even begin to convince me of a company rating seal.
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Comment from ProvenExpert.com: 
and thank you for the feedback.
Indeed, there are different users and Facebook or social media in general take a stronger role in individual industries.
Exactly for this we offer, for example, with the social links the possibility to also store their profiles on Facebook or Twitter in your profile, or to share your profile there as well and invite them to rate.
With the external sources, you can also integrate your ratings, e.g. from Facebook, into your ProvenExpert.com profile and have the score included.
We would be happy to help you make full use of the profile's possibilities! Please contact our support team at support@provenexpert.com.