I imported my bookmarks into pinboard, but found it quite a chore to go through them and tag them properly, so I abandoned that. Firefox sync keeps my bookmarks available everywhere anyways.

Now I use pinboard for my youtube subscriptions, every time I subscribe to someone on youtube, I add it to pinboard and tag it.

Very useful when your subscriptions range from several different sports to tech or gaming.

Would do same for instagram but I have too many subscriptions and it's useless when someone changes their @account.

They could really do with a lists feature ala twitter.