Relay updates:

1) When viewing someone's profile, events are requested from a random selection of 3 of your own relays + 3 of the other user's write relays. Previously it was asking only your own relays, and all of them every time.

2) When publishing an event, it is also sent to mentioned users' read relays (if less than 10 users are mentioned).

3) You can see a list of popular relays in settings / network.