 Facebook: For Facebookers (um, everyone, right?) it's essential beautifully designed, uber-functional implementation that's always with you. Free
 Tweetie: Twitter apps: there are a lot of 'em. Tweetie, though, is the closest you'll get to the Twitter desktop experience, and therefore our best of. $2.99
 Fring:
For the longest time it was taboo to even talk about VoIP on the iPhone, because Apple simply would not permit it. As luck would have it, there is now a legitimate and free way for you to conduct such activities if you deem necessary, and it can all be done with an app called fring.
fring isn't new to the mobile VoIP industry. In fact, it's been around longer than the iPhone itself. And now, iPhone users can exploit its features fully, with the expense of just a few minutes of downloading their app from the iPhone App Store. FREE
 NimBuzz: Nimbuzz apps: easy-to-use text and voice chat application that lets you connect to virtually every major IM service. Nimbuzz puts MobileMe, AIM, GoogleTalk, Skype, MSN, Nimbuzz’s proprietary service, and even Facebook right in your pocket, with excellent results.FREE
 LimeChat IRC Client: LimeChat IRC Client apps: LimeChat for iPhone is an IRC client for your iPhone and iPod Touch. It allows you to chat on the go in the same way as you do on desktop.$4.99
 IM+: IM+ (Plus) apps:
We've seen so many different instant messaging clients since the launch of the iPhone that it's actually rather difficult to be anything but judgmental when a new one comes along. IMPlus is yet another multiplatform instant messaging app that is trying to be your app of choice, but unfortunately it falls very far from that even being remotely possible.
You can load up your accounts for AOL, Yahoo!, MSN, Google Talk, Jabber, ICQ, and Myspace very easily through setup page. There aren't a lot of settings options for you to mess around with, which is something you'll get use to with this app. You can have more than one service $9.99
 IM+: IM+ (Plus) apps:M+ for Skype app allows iPhone users to talk with other Skype users all over the world, including calls to landlines and other mobile phone number, as well as to have conversations with other users who are logged in with their Skype accounts on PC or Mac.
$9.99
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