Well whatever phone you use but one thing which we have to agree that we love social apps on our phones and it's no wonder new OS WP7 OS already have some cool social apps which you should use on your WP7 Smartphones! Some of them very common and popular on almost all OS. Find some of best apps here:
Thanks for the post but.... I'm trying to understand how Adobe Reader and IMDB are "social" apps. I don't know about the rest of you, but I know only about 5 people who show up on an IMDB search, if that counts as "social".