Solved: Facebook sharer.php Not Working for Some Reason

So, we have a ton of share links all over our various domains at work. And much of our domain structure is based on users have subdomains (example:

All of a sudden, the sharer.php seemed to stop working. Some browsers stayed white, Chrome showed a grey error message with a 500: internal server error.

It took me a long time to track down the problem. I tried so many different things, but in the end, it was the CASE of the subdomain. 🙁 Changing it to solved the issue. So strange, undocumented, and frustrating.

I hope this helps someone down the road.

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