Squarespace is a popular website building and hosting service known for its visually appealing templates and user-friendly interface, making it an excellent choice for a range of websites, including portfolios, blogs, small businesses, and even some more significant brands. While it's more common to see Squarespace being used by small to medium-sized enterprises and individual creatives, there are some notable examples of larger websites that have leveraged its capabilities. Here are several prominent websites that utilize Squarespace:

1. Winona Ryder: The official website of the acclaimed actress Winona Ryder is built on Squarespace. Her site showcases her filmography, news updates, and other professional information, demonstrating Squarespace's ability to handle high-profile personal websites.

2. Keanu Reeves' Arch Motorcycle Company: The bespoke performance motorcycle company founded by actor Keanu Reeves uses Squarespace for its online presence. The site highlights their unique motorcycle designs, company story, and provides a media-rich platform for potential customers.

3. Lumio: Lumio, known for its innovative book-shaped lamps, uses Squarespace to run its online store. The website features sleek design elements and e-commerce functionalities that allow users to browse and purchase products easily.

4. Aimee Song's Song of Style: Aimee Song is a renowned fashion blogger and interior designer whose blog "Song of Style" is hosted on Squarespace. Her site showcases high-quality photos, style tips, and lifestyle content, demonstrating the platform’s capability to support visually-driven content.

5. Sadie Williams: This London-based fashion designer’s website is another example of how Squarespace can support creative and visually-oriented businesses. The site effectively presents her fashion collections with stylish, modern design elements.

6. FremantleMedia: A global content production and distribution company, FremantleMedia, uses Squarespace for some of its outreach and niche content projects. This highlights Squarespace's versatility in content management and presentation.

Considerations and Limitations

1. Customization: While Squarespace offers extensive design flexibility and a wide range of templates, it might not match the full customization capabilities of platforms like WordPress or custom-coded websites. This could be a limitation for websites requiring highly specialized features or designs.

2. Scalability: Squarespace is excellent for small to medium-sized websites but might face challenges as the website scales to require more complex functionalities, particularly those with high traffic, intricate workflows, or extensive integrations.

3. E-commerce Features: Squarespace provides robust e-commerce solutions, but it might not be as feature-rich as dedicated e-commerce platforms like Shopify. Businesses with complex e-commerce needs may find it lacking in areas like advanced shipping options, large product catalog management, or multi-currency support.

4. SEO Limitations: While Squarespace offers essential SEO tools, it may not be as powerful or flexible as platforms like WordPress, which have a broader range of plugins and capabilities to enhance SEO performance.

Practical Steps to Verify Usage

To verify if a particular website uses Squarespace, users can:

1. Inspect the Source Code: Right-click on the website and select "View Page Source." Look for mentions of Squarespace within the code, such as "//www.squarespace.com" in URLs.

2. Use Online Tools: Websites like BuiltWith or Wappalyzer can identify the technology stack of a website. By entering the URL of the website, these tools can determine if Squarespace is being used.

3. Check the Footer: Often, websites built with Squarespace may display a small credit in the footer indicating that the site is powered by Squarespace.

In conclusion, while Squarespace might not be the go-to solution for every significant online presence, it is certainly utilized by some notable figures and companies for its ease of use, aesthetic appeal, and robust functionality for small to medium-sized websites.