6 quick questions about bookmarks and resource managment

Hello people,

I am currently brainstorming an idea and would like to ask you a few questions that will greatly help me in this phase.

I'm looking to improve how people store their resources links, how they keep track of them and how do they share them among friends or colleagues.

Here are the questions:
1 - What tool do you use to store your important links?
2 - how do you categorize them?
3 - Are you satisfied with the tool that you are using? Or do you feel it can be better?
4 - Do you find it easy to reach and access previously saved links?
5 - How do you share links with friends or colleagues?
6 - Do you think a better management and sharing of those resources could improve your productivity?

Any opinions are much appreciated!