Question About: A Table Of Users Who Have Relationships To Other Users??

Hi,

I have a table of users somthing like this:

User_ID
Name
Hobby
Favorite_Food
Blah
Blah
Blah

Users can be friends with one another and I need some way of logging this.

My 2 options (that i can see) are:

1) Putting a friends entry in the main user table then comma delimiting the User_ID's in the friend entry like so:

User_ID: 001
Name: John
Hobby: Frizbee
Favorite_Food: Cake
Friends: 002,004,010

2) Making a seperate table with multiple entries for each user like so:

User: 001
Friend 002
---
User: 001
Friend: 004
---
User: 001
Friend: 010
---
User: 002
Friend: 001
---
User: 004
Friend: 001
---
User: 010
Friend: 001
---

The database has to be handled by a web service and/or a web appliction making the comma delimited option occupy more server time breaking down the string into usable user_ID's.
But (and this is probably my actual problem) if i was to impliment my second idea, I'm not sure what I should make the tables primary key or the best way to relate it to the main user table.

My initial thought is to just have a, technicaly useless, ID be the primary key and impliment a one(User) to many(friends entries) relationship... but im a bit of an access n00b so thought i better come ask for some advice.

Thanks.