Chime.in (beta)

The third way in 'rich-media' posting - this can link with facebook and twitter accounts. Currently trying it out (chime.in beta) tentatively after an automated email from Mixx. Naturally there's a mobile app and you can edit your profile, etc.

Kind of like twitter UI but nicer looking. Not sure where it will fit alongside linkedin, google+, facebook and twitter but maybe it offers something more holistic.

Claim your usernames now before they get taken!