They (Stack Exchange developers) are working on it. It's complicated.

Main sites are already usable via HTTPS. Meta sites are not, and will not be until the domain structure is changed. For details, see

• Untrusted connection when visiting per-site meta over SSL
• Better HTTPS support for Stack Exchange sites
• Stackoverflow.com: the road to SSL

They (Stack Exchange developers) are working on it. It's complicated.

Main sites are already usable via HTTPS. Meta sites are not, and will not be until the domain structure is changed. For details, see

• Untrusted connection when visiting per-site meta over SSL
• Better HTTPS support for Stack Exchange sites
• Stackoverflow.com: the road to SSL