You can't expect websites to be perfect. There will always be glitches and faults!
No, friends cannot see you playing on Steam when you are offline. Your status appears as "Offline," so they won’t be able to see any activity or games you are playing. If you want friends to see your activity, you need to be online and set your status accordingly.
You can see offline people using an application :http://www.alltricksbuzz.com/2014/02/how-to-see-friends-who-kept-you-offline.html
Look at the top of your page, and do you see that thigee with the tiger and wolf? ok. click on it and you can see who is online of your friends, and who is offline.
You can get 43 achievements offline on halo 3 im not sure on odst.
im not your friend, but my user is Narutorocks98
Yes, you can, but I'm not sure, if its possible to play with friends offline...
Maybe cuz he blocked u or unfriended u or he made himself offline to u.
Any of your friends who are logged on and check the chat box or have it open. You can appear invisible by clicking on Chat then Options then Go Offline. You will stay online, but appear offline. Just be aware that they can see any posts you make while you're invisible.
Main Menu -> Online Mode -> Online/Offline Mode, you should see your friend cards.
yes, see here: http://share.skype.com/sites/uk/2007/07/why_skype_instant_messaging_is.html;)
No, halo 3 forge is not offline, you may play it online with friends or others.
Yes, you can. You can play the campaign offline and against friends in split-screen mode.