Step 1-3: - #Mastodon: get the rss feed by adding ".rss" to the end of the url of someone's profile - Twitter profiles: get rss feed using #Nitter, ie http://nitter.net/Coptic_Chad/rss - #ScuttleButt: Get rss feed using http://viewer.scuttlebot.io
Step 4:
I can then use http://rsslay.fiatjaf.com to turn those feeds from 3 social networks into #Nostr profiles, and follow them on my nostr client of choice