Very often a business will come to the conclusion that they do not need to appear and have a presence on the social media websites. Although social media is more effective for certain industries or individual companies, I believe everyone should have some sort of account on there.
Social media marketing may not gain you direct sales, but if you are on Facebook or Twitter for example, it may mean that someone sees you and then contacts you in the future for a quote or service. It can also be a great way to build up your brand awareness. The more ways you can get your company name out there and the wider audience you can reach the better.
Some of the largest search engines now use social media in their ranking algorithm, in other words, will favour websites that also have a social media presence.
If you are unsure of how to go about setting these accounts up or have not go the time to manage them, then talk to a marketing agency who will be able to come up with a plan of action.