There is more to Social Media Marketing than just posting all the time to your various Social Media accounts. A LOT more!
People don't check Social Media to see what brands, your brand included, are posting. They check their Social Media feeds to see what their long distance relatives are doing. What their old school mates are up to and of course to watch funny animal videos. However. Social Media Marketing is an effective medium to get your brand's message seen by your target audience.
Having said that -- Here are a few common mistakes we see happen on Social Media all the time from brands trying to have a good overall Social Media Presence.
Sales, Sale, Sale all the time
Not Responding in a Timely Manner
Too Many Accounts
Paying for Shortcuts