Messaging and Social Networking

Facebook - Facebook, Inc.

Free
Keeping up with friends is faster than ever.
https://itunes.apple.com/us/app/facebook/id284882215?mt=8

Flipboard: Your Social News Magazine - Flipboard Inc.

Free
Flipboard is your personal magazine, at your desk, in your back pocket or on your wrist. Filled with stories, photos and videos on any interest, it’s a single place to keep up with your world. And now, if you want just a few highlights, the top ten stories can be sent right to your Apple Watch. Scan a summary, save it to a Flipboard magazine or share it with a friend. Collecting and sharing stories you care about has never been easier.
https://itunes.apple.com/us/app/flipboard-your-social-news/id358801284?mt=8

GroupMe - Mindless Dribble Inc.

Free
GroupMe - A Home for All the Groups in Your Life. Family. Roommates. Friends. Coworkers. Teams. Vacations. Greek Life. Bands. Faith Groups. Events.
https://itunes.apple.com/us/app/groupme/id392796698?mt=8

Hangouts - Google, Inc.

Free
Use Hangouts to keep in touch. Message friends, start free video or voice calls, and hop on a conversation with one person or a group. Say more with photos, stickers, and emoji.
https://itunes.apple.com/us/app/hangouts/id643496868?mt=8

HeyTell - Voxilate

Free
HeyTell® is a cross-platform voice messenger that allows you to instantly talk with friends and family. No account needed—just start the app, choose a contact, and push the button to start talking!
https://itunes.apple.com/us/app/heytell/id352791835?mt=8

LinkedIn - LinkedIn Corporation

Free
With the LinkedIn app for iPhone and iPad, opportunity is just a tap away. Build and nurture your professional network, stay up to date with the latest business and industry news, and find your next dream job.
https://itunes.apple.com/us/app/linkedin/id288429040?mt=8

Messenger - Facebook, Inc.

Free
Instantly reach the people in your life—for free. Messenger is just like texting, but you don't have to pay for every message (it works with your data plan).
https://itunes.apple.com/us/app/messenger/id454638411?mt=8

Skype for iPhone - Skype Communications S.a.r.l

Free
Say “hello” to the new Skype for iPhone. Remastered to put your conversations with the people who matter most at your fingertips. Stay in touch with free messaging, voice or video calls on Skype. 
https://itunes.apple.com/us/app/skype-for-iphone/id304878510?mt=8

Twitter - Twitter, Inc.

Free
Twitter is a free app that lets you connect with people, express yourself, and discover more about all the things you love. See what your favorite celebs and athletes are chatting about. Be the first to hear breaking news. Catch a glimpse behind the scenes at concerts, sporting
events, and more.
https://itunes.apple.com/us/app/twitter/id333903271?mt=8

Twitterrific 5 for Twitter - The Iconfactory

Free
The first app of its kind on the App Store, Twitterrific is the award-winning, elegant Twitter client that’s easy to understand and a delight to use.
https://itunes.apple.com/us/app/twitterrific-5-for-twitter/id580311103?mt=8

WhatsApp Messenger - WhatsApp Inc.

Free
WhatsApp Messenger is a smartphone messenger available for iPhone and other smartphones. WhatsApp uses your 3G or WiFi (when available) to message with friends and family. Switch from SMS to WhatsApp to send and receive messages, pictures, audio notes, and video messages. First year FREE! ($0.99 USD/year after)
https://itunes.apple.com/ao/app/whatsapp-messenger/id310633997?mt=8