@mjc How do you exactly ask? If I ask someone "Could you please send me a link for your account on the Fediverse?", they might not have an idea what I am talking about and even if they know, they might be confused what Fediverse service they shall choose. I have difficulties to send a link describing "Fediverse" or an information like "please subscribe here: ...." For example, if I send www.joinmastodon.org they might end up in very small instances that might not be well federated.
@gerald_leppert hopefully that prompts the recipient to ask, "what's the fediverse?" which opens up the opportunity for you to tell them what it is, and provide them links.