We have a pump.io bridge here at friendica, which means that you can use friendica as a "client" for your pump.io account. That's how I use pump.io, getting the pumps into my network tab at friendica, alongside with all the other things that get into it.

And so far, there are many decentral socnets but only a very few federating once which let you communicate natively with other socnets as well.