Primal and Nostur both let you create a custom feed of selected users. They also both have some algo feeds that they curate. Good way to achieve this.
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Each time you want to add a new npub you need to recreate the curated feed from scratch with the search function tho. Very annoying
In Primal, yes. In Nostur, you can edit the existing feed to add or remove contacts. Hopefully nostr:nprofile1qqs9xtvrphl7p8qnua0gk9zusft33lqjkqqr7cwkr6g8wusu0lle8jcpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqghwaehxw309ahx7um5wgh8qctjv46x7tn5damkuaa68e2 has this feature on their radar