Add threads icon to social icons block

[paxblueribbon]

What

In the list of social icon blocks, add Meta's new social media: Threads

Why

This would allow users to link their threads profile

How

requested in zdc6508361

[karenroldan]

📌 ACTIONS

• Feature request kept

[ezebecke]

Another request in https://scottsolomon.com/

[aisajib]

This was also requested here: https://wordpress.com/forums/topic/where-is-the-threads-icon/

[aamills]

Requested in 6631426-zd-a8c

[github-actions[bot]]

Support References

This comment is automatically generated. Please do not edit it.

• [ ] 6631426-zen

[dolgelukkig]

requested by another user here: 7464651