Help me with expressing "myself" on short form social media

I have no doubt what i want to write about here on DW/LJ. Partly it is my place to talk to myself with other folks welcome to listen in. If anything, journals that seem to be to a specific audience always leave me feeling excluded as not part of that set (not the group that goes to the con, or participates in certain events, or all socialize together or whatever).

I started with other short-form social media as a early adopter, curious about what folks would do with things. At this point, i feel like i am a content consumer more than a participant in FB, Twitter, LinkedIn, Diaspora, Google+. A good part of this has to do with identity and naming and control of content: on FB and LinkedIn, i am in my public self mode. With G+ and Diaspora there's a little more control of who sees what, like here, and so i could let down my hair (if i hadn't cut it all off).

Resurrecting my Elaine Grey twitter account has let me bleat some of my distress in short form, instead of here, and i welcomed the handholding i received in response. Twitter has so much volume, though, that i can't use it the way i did early on, which allowed me to meet up with brian1789 and mactavish on short notice. That is, i can't follow every post in real time to find out, cool, so and so is free for lunch, and lo, so am i!

I find myself wondering what i should post on the various short-form social media. I used G+'s location service when i went to the concert last Friday. I'd used a lot of the locative services early on, before the services took off, and determined that i really do live in a rut between office and home. I play with the idea of challenging myself to, once a week, post that i'm free for lunch or tea either in MV or San Mateo on a specific day. My hesitancy is asking myself should i use the social spoons with the people who have asked me out for tea or lunch and i've been too busy?

If you are connected to me on a short form service, do you have any advice about what i should post?

What do you think is useful for professional networking? A ratio of one personal thing (concert, creation, cat photo) to one professional thing (observation about tech)?

I should ask my (ex)boss about what "they" say about social media and job networking.

I follow all the services, delighted to find out what folks do, how they live, what they think. I know "Be your authentic self" is the best advice. But i am so ... scattered? diverse? eclectic? inconsistent? unpredictable? ... or boring? Too asynchronous and replying far later than any "conversation".... (Thank you weofodthignen for also being asynchronous!)