If you’re a Twitter user, you’ve seen the t.co domain the company uses: It rewrites all URLs in tweets to pass through this redirecting domain to track “engagement.” It wants to know how many times links are passed—ostensibly, it could also filter against malware and spam, though I’ve never seen such a mechanism engaged.
But for years, some Twitter users in OS X have had a problem with t.co in Safari. Instead of redirecting, the link results in an endlessly loading page that times out. Reloading the page results in a non-existent domain. Reload again, and the destination URL finally loads.
What’s up with that? Nobody knows! Or at least, nobody did. I looked at years of forum postings all over in which people noted the problem, and no one had a consistent solution. That appears about to change.
Read more here:: How to fix the t.co Twitter problem