Here is a collection of various iPhone-friendly sites for you to browse. Stay connected to your various social networks in their mobile-optimised versions:

Facebook – Addicted to Facebook? When you need to check your notifications on the go, Facebook has a smooth, highly function variation of their site for use on the iPhone.

GetLeaflets – A wonderful site optimised for the iPhone that helps you find other sites optimised for your beloved iPhone. 

Twitter – It would be a truly horrible thing if you didn’t let everyone know what you were doing every second, every day. 

Hahl0 – a similar service to Twitter that lets you keep in touch with other people, all the live-long day. 

Flikr – See online photo collections in a smoother than ever Flikr interface.

Meebo – Log into your IM accounts from your iPhone, if being on a phone itself isn’t a convenient enough way of communicating for you.