Let’s face it this is likely the first social media app you ever started with and if you’re a business, nonprofit or just a person this app is absolutely necessary.
HootSuite Lite for Twitter
Showing my preference here but if you only manage a few twitter accounts this is my preference for a iPhone tool for tweeting. If you manage more than 3 twitter streams opt for the full version (it’s cheap enough and good enough to pay for).
Not as big of a fan of linked in but if you’re on it and want to stay updated with the network then you’ll need this app.
Flickr
You’re at a conference. You’re taking pictures on your phone. Now you can upload and tag them and be a part of the picture conversation instantly. No need to wait to upload photos.
Foursquare – Find Places to Eat, Drink, and Visit
This is a great social media/networking tool. Find who is at an event with you. Follow them and continue the conversation on a break or after the convference. A must have for this purpose alone.