While a number of people I know in the IBM world are active in Google+, there are many others who clearly tried it out for a while but gave it up after last posting in early 2012.
Support and capabilities for company pages has improved dramatically, and while I don't do much with that, a number of companies have run with the idea of page that can have related communities, invite people to Events and Hang Outs.
While I know that IBM has its own communities based on its own software and such, the one other thing that Google+ has is new customers. Facebook is not an ideal way to meet new people and do soft marketing, and Twitter is too staccato for developing new relationships, but Google+ makes that very easy and integral to the experience. At the very least, don't leave your account like an orphan advertising that its owner no longer cares or engages.
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