Even very popular website can have some security issues...

[polonus]

L.S.

Here we see issues with RC4 for scripts running from an external link -https://s1.adformdsp.net/ (neatly blocked by uBlock Origin for me.
The main site we checked for cookies: https://webcookies.org/cookies/www.cleverbot.com/4847168
Vulnerable jQuery library used: http://retire.insecurity.today/#!/scan/7f2910f3d6d8fff70a5ef5d65ab7f900a8bc57de18e4eb752c92edb4114a921f
For the first link with Grade-C SSL config: http://toolbar.netcraft.com/site_report?url=https%3A%2F%2Fs1.adformdsp.net%2F
Has been frowned upon: http://www.exterminate-it.com/malpedia/remove-adform-net

For that main website F-status and recommendations: https://observatory.mozilla.org/analyze.html?host=www.cleverbot.com

Site is a chatbot site to experience AI technology, be cautious letting minors use this.

57 adblocks means the site is ad-tracking in real Google fashion  be careful with the facebook connections (privacy and censorship concerns).
Consider: https://urlscan.io/api/v1/result/378f509c-c82d-4488-88d3-2966b2be9be7/

Certificate issue: Root installed on the server. (wXw.existor.com) hosted by -UK2.NET.
For best practices, remove the self-signed root from the server.

polonus (volunteer website security analyst and website error-hunter)