I apologize, but I don't have any specific information about the domain "66smsm.com". This appears to be an unknown or potentially newly registered domain name. Without more context, I can't provide accurate details about its purpose or content.

If you're looking for information about this site, here are a few steps you could take:

1. Visit the website directly if it's live and see what content is provided.

2. Use WHOIS lookup tools to find out who registered the domain and when it expires.

3. Check online reviews or business directories that might list the site.

4. If you encountered this in the context of a specific activity (like receiving emails or messages), consider where you saw it referenced.

If you have a specific question about this domain or if there's additional context you can provide, I'd be happy to try to assist further based on that information.