That's a possibility. Right now it pulls the most 5 common tags from the last 50 posts that you submitted. However, I suspect many users would leave it blank if it were suggestion only. But I do think the idea of suggested tags is interesting. Thanks. I plan to make those pages sortable by shares, etc, just like the other feeds.The rest of this is awesome, I love my interactions history.
"submitted" --I'm assuming you mean shared, because I don't submit #weeklymusicthread anymore. I have #comedy and #askhubski on mine also, which aren't tags I've used much if at all. Submitted is a better metric than shared; but letting us do it ourselves (maybe as a choice?) is best in my opinion. Just as long as the idea is on your radar.
I think you should maybe look at how you're pulling the "used tags" fields - it looks like you're also pulling tags that others have applied to your posts. I have no recollection of ever tagging something "#language" yet there it is... Otherwise, awesome. I dig it.