Twitter counting is using un-secured internal API

[markstos]

I noticed that the URL used counting tweets does not use 'https://', which can be a problem on secure pages.

Further, as noted here, that insecured URL is intended only for internal use by Twitter, and they do not appear to offer version of it that uses https://

https://dev.twitter.com/discussions/5653

Instead, using their Streaming API for counting tweets is recommended. There are options to use 'https://' to access the streaming API.