A few months ago I would have said Instagram....but now I'm not so sure. The algorithm changes and push to video has spoilt it for me. On the look out for 'the next big thing'.
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Twitter definitely
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LinkedIn: But how it was in the early days.
helps with networking :)
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Definitely reddit. The community there is very lively and you can find a lot of valuable information there.
Unpopular opinion but yeah its Quora for me because of wide range of audience and discussions :)
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Twitter. The inflow of validated news and content is supreme on Twitter. You will find recurring screenshots of tweets found on other social media platforms by the time the news becomes overtly irrelevant.
Twitter. A short, quick burst of dynamic content with real-time updates and trends combined with entertainment. Memes on Twitter are my favorite form of social media content.
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