A new survey shows that the use of social networking hubs like Twitter, Linkedin and Facebook by medical device companies appears to be on the uptick, at least in Massachusetts. Co-sponsored by Schwartz Communications and the Mass. Medical Device Industry Council, the 15-question survey of about 70 representatives of the medical device industry in the Bay State looked at how med-tech players use the tools to engage customers and prospects. Just 23 percent of respondents said their company “actively used” social media, with 46 percent saying their company used it “a little, but not a lot.” Sixteen percent of respondents said their company didn’t use any social media or networking sites at all.