In each web, social, blog or forum site, there is a link which enables you to raise complaints about any of your dissatisfaction to the site administration. Under the "impersonation" category, you can lodge complaints to the site administration to remove the account.
For your information, any site administration will prioritise direct complaints from you. In lodging a complaint, you will be required to upload a copy of identification card/passport (any valid document produced by the Government) in digital image format to serve as reference that you are the real name owner.
Example: Complaints to Facebook
Go to this link : https://www.facebook.com/help/contact/169486816475808
Please follow below steps :-
If someone posted inappropriate postings/status on facebook, how do you report?
Example: Complaints to Twitter
MCMC would like to advise you to report the matter to Twitter site operator at https://support.twitter.com/forms/impersonation, because a direct report from you will be preferred by the Twitter administration.
You need to fill in the complaint information form provided by Twitter according to the following steps:
i. Click the link above and fill in the appropriate section as provided
ii. Enter category: complainant, complainant representative, complainant friend or company representative
iii. Complainant full name
iv. Complainant email address
v. Complainant Twitter username (if any)
vi. Information related to false Twitter account user, i.e.:
a. False Twitter account name : misai_kuceng (EXAMPLE)
b. Description of the false Twitter account
vii. Fill in other details in "Wrapping up" section and click "Submit"
If someone posted inappropriate postings/status on twitter, how do you report?
Go to this link : https://support.twitter.com/forms/impersonation