Very similar to Hootsuite, Buffer is powered in large part by the Browser Extension, though for me it is a little simpler. For a start-up I think Buffer would be the easier to use so you can move on to the job of actually making some product and selling some stuff!
I believe the price is similar at c.$10 per month.
Buffer helps you manage multiple social media accounts at once. Quickly schedule content from anywhere on the web, collaborate with team members, and analyze rich statistics on how your posts perform.