There's loads of things going on while your online, programs checking for avaliable updates, time syncronising, your ISP checking that your still there so as that you don't get timed out et cetera.
Of course there's always a chance that it's some spyware.
Disclaimer. (1) Whilst I will help you sometimes, if I feel like it, and my advice in relation to your actual question will be of good quality: my posts are to be taken with a pinch of salt. I will be sarcastic, deploy irony and include obscure cultural references for my own amusement without warning.
(2) You will gain nothing from complaining, and if you try to argue with me then you will not win. No matter how noble your battle seems, I am still better than you, don't be an hero.