I run a link shortener site, and use it privately and don't publicly expose the API.
One thing I noticed regarding analytics, is that the click count is always skewed. When I post a shortened URL on Twitter, within seconds the click count is always `>10` views. After further investigation, it seems there are automated bots that scoop up URLs the very second they are posted.
Also Twitter runs little microbrowsers that scan the page for metadata which helps them create a 'preview' of the link.
After looking at the useragents of some requests I'm seeing generic Firefox UAs which I can only assume are random surveillants (not bots) who habitually scan Twitter for interesting or anomalous content. We truly do live in a world where nothing is left `unseen` (by bots or actual humans).