Once you've decided to invest in social media marketing, your next key challenge is to decide which platforms you should be focused on.

This used to be relatively easy - you started a Facebook Page, set-up a Twitter profile, and then added others over time. But now, things have changed. Instagram is a much bigger consideration, Facebook's dwindling organic reach means it may be less of a priority, Twitter's algorithm changes the equation, and LinkedIn's seeing more traffic. Pinterest, too, is on the rise, while if you're going to create video content, then YouTube definitely should be on your radar.

But you can't be active on all of them all the time - so which platforms are right for your business and marketing efforts?

This infographic from Angie Gensler might help. Gensler has provided a brief overview of key stats and insights for all the major networks, and notes on what each is best used for.

It might help you in your thinking - check out the infographic below.