One of the best things about online marketing is the ability to *easily* test.
Whether it’s specific concepts, designs, wording or choice of photos; basically any part of what makes your content can be compared using several versions to see what your audience reacts to better (yes, that includes conversions on your website).
I’m not saying you need to test every single post you publish on Facebook or LinkedIn but for important or high budgeted campaigns, product launches, significant sales periods or ongoing campaigns (Google Search is a great example) – it’s SO worth the effort.