It is not a matter of being available on all of the social media networks. The need is to be there on each network where your target customers are available. It calls for testing the media sites that seem fit for your online promotion. For instance, if you deal in interiors, fashion deigning etc. then putting the images of work on Pinterest would be of relevance. Companies selling professional services such as IT, medical, finance etc. shall promote themselves on platforms like linkedin and product sellers can choose promoting them on Facebook. Since everything on internet can be tracked and estimated, there is no harm testing and experimenting with all the tools you have in possession.