Saw I had some new friend that I never had accepted a requist from nor sent

I also have noticed that someone is online when I have not signed myself in I did change password

But am wondering to delate the account

I noticed that when the site design changed (you know, to look more like facebook) I suddenly had a load of old friend requests re-appear (ones from years ago - which I had rejected with no reason i think, or maybe just ignored I'm not sure.)

Anyway, I would imagine that if I accepted any of those requests, and the players were still active, they may be just as surprised as you were here to find someone had accepted a friend request they no longer remembered. This is just a guess as to what could have happened here, maybe check in your games database to see if you ever played them, and if so, when? It may give a hint.

But yes, changing passwords is always a safe thing to do in any case

This shouldn't happen. Changing the pwd was a good idea.