I was prompted to write a response to this article today after helping a friend look into her Squarespace site.  It's not like I expected it to have the equivalent of Wordpress' amazing Yoast SEO plugin, but I was at least expecting some nice control over metadata.

However, I discovered users have almost no control over the Title or Meta Description tags on the individual page level.

I even tweeted at SquareSpace support, and they admitted it was not an option yet (at least of 9/2/2016): https://twitter.com/SquarespaceHelp/status/771819238101176320

Right now, you can only add custom titles and descriptions on what Squarespace calls "pages" - but beware, not all pages are created equal.  Blog posts are not pages. Neither are e-commerce products.  My friend wanted to optimize her product page title tags, but she can't.  So disappointing.

Fingers crossed that SquareSpace updates their CMS to maybe allow for this someday....