mreza 15 Newbie Poster

Lately I'm noticing that sometimes when I loged off my Gmail account, it got automatically log in, and moreover in my Facebook account it got automatically change from most recent feed to most popular Feed.Although, I did checked my history loged IP adress and found that The indicated IP address is only mine, no different divice or IP address had shown there. and I had my file and printing sharing option keep disable. Well, I am using XP sp 3. and my Question is, Is it possible for my local cable intenet service provider to simulteniously log to my account during my log ? If so, then how? and which software can able to identify and prevent it? Although I am using AVG internet security and its firewal could indentify new network that try to establish new connection to my PC and disable that automatically but I'm still faceing above problem. I will be glad if any one help me out of this problem. Well, Have a great Day.