You cannot simply just delete anything. Once you publish anything to a relay, such as a note or account, it's there to stay.

You can *request* that a note or account be removed from relays, and some will accept the removal request. However, most won't. And even though some relays will remove the data, it will still remain on the relays that didn't.

And even the relays that will remove the data, I'm pretty sure that they will just eventually download the information again if it gets observed by a relay that still has the data.

Just be careful what relays you connect to, and/or what you are publishing.

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Furthermore, just to stay on the safe side (because you can't really delete anything), I personally avoid making posts about hot takes, politics or religion.

Is it generally best practice to connect to fewer, rather than many relays?

It depends on what the relays are, what you want your outreach to be, and how much data you are willing to consume on your internet. For instance, if you buy access to nostr.wine, it is a relay that aggregates a lot of popular relays, so getting nostr.wine alone will cut your necessary relay list in half.

To a certain extent, many users including myself, would say that the number alone is inconsequential. There was a point where I was connected to 20 relays at once, which is common.