See Keith's introduction here: worldpressphoto.org/academy/apps-photojournalist

Links to the apps mentioned:

Photosynth
Panoramas
photosynth.net

Vine
Short video loops, tweeted
vine.co

Tout
Reporters with cell phone cameras only need a few seconds to tell their stories, how about photojournalists?
tout.com

Instagram
Social photography with a filter twist
instagram.com

Soundcloud
Human-voiced, audio storytelling made simple, via your desktop, tablet or mobile phone
soundcloud.com

Not mentioned:

Vyclone
Multi-cell cam, geo-coded video production
vyclone.com

Hipstamatic
Social photography with a filter twist
hipstamatic.com

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