Choosing the images to go with your company page on Facebook or Twitter profiles are key to how you want to be seen by your customer. One really good image can say what you do or what type of company you are in seconds, keeping potential customers on your profile for long enough for them to get to know more.
Beware the stock photo!
Stock photos are all very good and have a certain value but they need to be very carefully chosen so that they do not look like the awful corporate images seen everywhere. Here is an amusing article about how cheesy stock photos might work for once: https://www.entrepreneur.com/article/243613 (to promote the Unfinished Business launch).