[BLOG] Add blog post about our selftags improvements

v3/updates-selftags.md

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+Updates: Add selftags
+
+Under [our milestone for better tag
+handling](https://www.gnusocial.rocks/v3/milestone-tags.html), one of
+the tasks has been to add the ability for users to add tags to
+themselves, so that they may be found and recommended to those
+interested in said tags.
+
+In the future, the use of these tags will allow you to find people,
+groups and even individual notes that have a tag you're interested in.
+This process is opt-in, yet simple - we don't want to make have a
+recommendation algorithm which could hide information.
+
+These tags will be subject to potential moderation, depending on the
+preferences of your instance's sysadmin. Remember: if you don't agree
+with them, you can always create your own instance! That's the beauty
+of the fediverse.
+
+The process for adding tags is simple: in your profile settings page,
+there will be a text field where you can type a list of comma or space
+separated tags. These will then show up in your profile, but you can
+change them at any time. And worry not, we don't keep a record of your
+past tags.