This week's 'Skim: Twitter tests longer tweets (but how long and for whom?); LinkedIn users' content preferences; Facebook rolls out ability for brands to retarget physical-store shoppers on the social network; Instagram could soon hit one billion users; new app tbh tops app store charts, aims for positivity among teens; four tools to help your brand research competitors' social media strategy; Homeland Security's plan to collect immigrants' social media info; and much more...

Skim for your weekly social media rundown!

1. Twitter testing longer tweets... for some

That's right, Twitter's famous 140-character constraint might soon get the boot. The news is coming right from the mouth of co-founder Jack Dorsey himself. The social network is testing the ability for a small group of users to tweet with 280 characters, doubling the former limit, in the hope that users will post more.

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image of Christian Neri

Christian Neri is a digital marketing professional in the film & television industry, and a contributor to MarketingProfs. An American expat in Paris, he recently completed his MS in digital marketing at IÉSEG School of Management.

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Twitter: @christianneri