Yes. Friendica for example supports Activitypub but also the diaspora protocol

Mostly offering language help and receiving it. I connected with a French guy and helped him with his German. In exchange he helped me with my French. We just connected over reddit everything else was done between us

Not sure if you are willing to goonb reddit but I’ve found speaking partners on r/languageexchange in the past

This reminds me oft the book “the circle”

“/e/” also is a pretty good choice if you want microG ready to go about your life