I've been a long time Android user and I loved it. Then I moved to WP7 last month and realised what a POS OS it is. But ever since I saw the N9 I can't get my eyes off it. I've sold my WP7 and now looking to get a N9 however there are a few questions I need to ask before I can make a move. Please do answer if you know

1- Gmail push notifications- Are there any? And when I get it does it show up in the feed menu or the top notification bar(apart from the stand-by screen)? Is there an audible notification?

2- Does the facebook timeline in the feed automatically get refreshed or do I have to do it manually? Is stuff related to me (wall posts, comments) highlighted or something? Same goes for twitter feed and mentions.

3- GTalk and Facebook chat- When I get a message, how am I notified? Is there some sign or something in the top notification menu or the standby screen with the clock? Is there a audible notification for this?

4- Does WiFi always remain on or does it turn off when phone goes into standby?

5- Do contacts automatically get synced with Facebook/Twitter?

Sorry I know these are trivial things but they did bother me a lot on WP7.