As there were speculations in other posts like COMET MEMBER LOGIN; ZIP FOLDER DATE MATCHES PODESTA PASTA DINNER WITH ALAFANTIS about connections between different sites cause of the same login area (http://www.cometpingpong.com/protected/) and administration I want to share my results in investigating. My approach only covers the technical aspects and not the content of the sites. Always remember that false and fast accusations could harm innocent people and waste your time .

Login Form:

The login form used by http://www.cometpingpong.com is just an out of the box JIMDO solution. JIMDO is a website hosting provider which makes it pretty easy to build homepages.

Here you can see how such login form is made with JIMDO:

http://support.jimdo.com/basics/editing-your-navigation/

https://www.youtube.com/watch?v=p9j0vknkOz8

This is just a random picked site using the same member protected area (Same message, same input icon...):

http://www.tlqwgc.com/protected/

IT company behind Comet Ping Pong:

If you use a whois domain lookup tool you can find information like "Name Server", "Registrant Organization" and "Registrant Name":

Domain Name: COMETPINGPONG.COM
Registry Domain ID: 
Registrar WHOIS Server: whois.domaindiscover.com
Registrar URL: https://www.tierra.net
Updated Date: 2016-09-30T08:53:47Z
Creation Date: 2007-10-15T18:31:34Z
Registrar Registration Expiration Date: 2017-10-15T22:50:28Z
Registrar: TIERRANET INC. DBA DOMAINDISCOVER
Registrar IANA ID: 86
Registrar Abuse Contact Email:  [email protected]
Registrar Abuse Contact Phone: +1.6193932105
Reseller: 
Domain Status: clientTransferProhibited
Registry Registrant ID:
Registrant Name: Maureen Gallagher
Registrant Organization: Kalorama Network Services
Registrant Street: PO Box 21734
Registrant City: Washington
Registrant State/Province: DC
Registrant Postal Code: 20009
Registrant Country: US
Registrant Phone: +1.2023474731
Registrant Phone Ext:
Registrant Fax: +1.2023478607
Registrant Fax Ext:
Registrant Email: [email protected]
Registry Admin ID:
Admin Name: Maureen Gallagher
Admin Organization: Kalorama Network Services
Admin Street: PO Box 21734
Admin City: Washington
Admin State/Province: DC
Admin Postal Code: 20009
Admin Country: US
Admin Phone: +1.2023474731
Admin Phone Ext:
Admin Fax: +1.2023478607
Admin Fax Ext:
Admin Email: [email protected]
Registry Tech ID:
Tech Name: Maureen Gallagher
Tech Organization: Kalorama Network Services
Tech Street: PO Box 21734
Tech City: Washington
Tech State/Province: DC
Tech Postal Code: 20009
Tech Country: US
Tech Phone: +1.2023474731
Tech Phone Ext:
Tech Fax: +1.2023478607
Tech Fax Ext:
Tech Email: [email protected]
Name Server: NS1.JIMDO.COM
Name Server: NS2.JIMDO.COM
DNSSEC: 
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/

Source: http://whois.domaintools.com/cometpingpong.com

So now we know the domain was registered by Maureen Gallagher from Kalorama Network Services and is hosted by JIMBO.

Kalorama Network Services

As the following listings proof in fact there is a company located (1656 Kalorama Rd NW) near Comet Ping Pong called "Kalorama Network Services" managed by Maureen Gallagher: https://www.linkedin.com/in/maureen-gallagher-18401a8/de https://nuwber.com/person/563a942a7686b0176b94847d

This is their homepage: http://www.kaloramanetworks.com/

With the collected informations I made a reverse whois lookup by the Registrant Email and got 30 sited assiciated with Kalorama Network Services:

Domain Name Creation Date   Registrar
adamsmorganday2015.com  2015-08-12  TIERRANET INC. D/B/A DOMAINDISCOVER
anc1c.org   1999-03-11  TIERRANET INC. DBA DOMAINDISCOVER
artbyamymac.com 2012-11-14  TIERRANET INC. D/B/A DOMAINDISCOVER
bucksfishingandcamping.com  2003-10-08  TIERRANET INC. D/B/A DOMAINDISCOVER
choctal.com 2005-03-16  TIERRANET INC. D/B/A DOMAINDISCOVER
choctal.net 2005-03-16  TIERRANET INC. D/B/A DOMAINDISCOVER
cometpingpong.com   2007-10-15  TIERRANET INC. D/B/A DOMAINDISCOVER
electionline.net    2001-06-19  TIERRANET INC. D/B/A DOMAINDISCOVER
electionline.org    2001-06-19  TIERRANET INC. DBA DOMAINDISCOVER
envisionadamsmorgan.com 2012-11-14  TIERRANET INC. D/B/A DOMAINDISCOVER
envisionadamsmorgan.net 2012-11-14  TIERRANET INC. D/B/A DOMAINDISCOVER
envisionadamsmorgan.org 2012-11-14  TIERRANET INC. DBA DOMAINDISCOVER
evolution-dc.com    2008-11-03  TIERRANET INC. D/B/A DOMAINDISCOVER
flappyduck.com  2008-03-18  TIERRANET INC. D/B/A DOMAINDISCOVER
geopatconsulting.com    2006-06-12  TIERRANET INC. D/B/A DOMAINDISCOVER
hytoneartsmanagement.com    2010-03-26  TIERRANET INC. D/B/A DOMAINDISCOVER
kaloramanetworks.com    2002-05-23  TIERRANET INC. D/B/A DOMAINDISCOVER
lebdisputeresolutions.com   2012-01-31  TIERRANET INC. D/B/A DOMAINDISCOVER
lebdr.com   2012-02-01  TIERRANET INC. D/B/A DOMAINDISCOVER
lebmediation.com    2010-02-26  TIERRANET INC. D/B/A DOMAINDISCOVER
michaelleb.com  2010-02-26  TIERRANET INC. D/B/A DOMAINDISCOVER
mwawellness.com 2012-04-16  TIERRANET INC. D/B/A DOMAINDISCOVER
pearsonrealty.net   2014-05-12  TIERRANET INC. D/B/A DOMAINDISCOVER
reedcooke.org   2007-10-15  TIERRANET INC. DBA DOMAINDISCOVER
sa-lawyers.net  1999-02-04  TIERRANET INC. D/B/A DOMAINDISCOVER
smithlandingconstruction.com    2012-04-10  TIERRANET INC. D/B/A DOMAINDISCOVER
smithlandingconstruction.net    2012-04-10  TIERRANET INC. D/B/A DOMAINDISCOVER
smithlandingoutfitters.com  2012-04-10  TIERRANET INC. D/B/A DOMAINDISCOVER
smithlandingoutfitters.net  2012-04-10  TIERRANET INC. D/B/A DOMAINDISCOVER
thepearsongroup.net 2011-07-21  TIERRANET INC. D/B/A DOMAINDISCOVER

Source: http://viewdns.info/reversewhois/?q=mgallagher%40kaloramanetworks.com

I checked some of the sites and could not find any connections besides bucksfishingandcamping.com and cometpingpong.com are made by the same IT company. So this is more like the "Don't dig into wrong directions" post, but maybe you can use it for own investigation.