There’s a ribbon like icon under each post that it’s grey, blue or orange, but I have no idea what it means. Anyone know?
Think it’s just the bookmark glyph you’re mentioning.
Grey: You’ve read the post but don’t have it bookmarked.
Blue: You’ve bookmarked the post.
Orange: It’s the last post you’ve read and you do not have it bookmarked.
Tooltip’s do try to suggest what they mean. Once you have a post bookmarked:
it seems you can find it from your profile section:
The orange bookmark glyph seems to work about half the time. Sometimes it’s not too accurate. But seems like quite a few people pick up on that on the meta site for discourse. Favorites with the star icon does come up on the front page itself as the “Starred” tab