You could try Zoho Support ($12/user/month) - this will provide you with a help desk including social media monitoring. In terms of live chat, you will need to

You could try Zoho Support ($12/user/month) - this will provide you with a help desk including social media monitoring. In terms of live chat, you will need to find a service that integrates with Zoho (i've seen a few of them around but, can't recall any right now).