Hi @AdventuresWithRosy . Thanks for reaching out. Although there is no particular rule for signatures, we always need to follow Local Guides Program Rules (you can find them here).
There’s no prohibition to share your social media in your signature. On the other hand, you should avoid sharing any advertisements. You mustn’t also share personal information like phone number, email address, home address, credit card number, etc.
Thanks for reaching out! Just as @AlexandreCampbell shared with you there are no specific guidelines for the signature, except for refrain from advertising or adding links to sites that include some kind of advertisement.
My advice is to not share personal information such as phone number, (email) address, etc. You also shouldn’t use any kind of Google or Connect logo. The Local Guides logo is a Google brand identity and is reserved for official use only. Do not use the Local Guides logo, pin, or any other Google imagery in any of your online or offline materials without expressed written permission.
P.S.: Therefore you can conclude that you can add a personal blog, social media link to your profile as long as you don’t violate our program rules.